• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    preliminary seal, preliminary seal arrangement and seal ring comprising the preliminary seal. preliminary seal comprising an essentially circular disc (1) of an electrically conductive material (2) permeable to air and a carrier body (3), where the disc (1) is configured as a separate piece produced separately - in relation to the carrier body (3) - and is attached to the carrier body (3).
    公开号:BR102015016623B1
    申请号:R102015016623-0
    申请日:2015-07-10
    公开日:2021-04-13
    发明作者:François Colineau；Günter Hintenlang；Thomas Klenk；Stefan König
    申请人:Carl Freudenberg Kg；
    IPC主号:
    专利说明:

    DESCRIPTION TECHNICAL FIELD
    [0001] The invention relates to a preliminary seal, a preliminary seal arrangement and a seal ring, which comprises the preliminary seal. Prior art
    [0002] A seal ring, comprising at least one dynamically tensioned seal shoulder and a preliminary seal, which is arranged axially spaced adjacent the seal shoulder, wherein the preliminary seal is composed of an electrically material conductor, it is common knowledge, as is a sealing arrangement, which comprises said sealing ring. The sealing ring, in this case, can be configured as a sealing ring of the radial shaft, in which the sealing lip faces the medium to be sealed in an axial direction. In contrast, the preliminary seal faces the environment in an axial direction.
    [0003] The preliminary seal has the task of inhibiting contaminants in the environment from penetrating to the sealing boss. This results in better functional properties of the sealing lip over a longer service life.
    [0004] A sealing ring and a sealing arrangement with this formed are known from DE 103 40 802 A1. The sealing ring comprises a first component, which has at least one sealing lip, in which this component of the sealing ring is composed of an electrically conductive material that has elastic rubber properties. The well-known sealing ring is used for sealing components, which include toothed parts, in which load separations occur during the movement of these toothed parts. The resulting flows are thus partly diverted by a used lubricant, and partly the flows are carried in addition to the components to be sealed in relation to each other. As a result of the electrically conductive and elastic rubber material, of which the first component of the seal ring is composed, it is advantageous that the flows can simply be diverted through the seal ring. In one of the previously known exemplary embodiments, a dirt shoulder is associated with the sealing shoulder dynamically tensioned on the side facing out axially from the space to be sealed, which is integrally formed with, and of the same material as, the shoulder of sealing, and is therefore also composed of an electrically conductive material and elastic rubber. Polyamide is cited as an example of an electrically conductive material.
    [0005] Another sealing ring is known from DE 103 14 924 A1, which is used in a sealing arrangement for sealing a machine element, preferably an axle. The sealing ring comprises a deposit for the absorption of leakage, in which the deposit is monitored by a measuring device. The measuring device is formed by a capacitor, and the deposit functions as a dielectric. The deposit is preferably configured as an absorbent or swelling, substantially annular disc that is composed of a porous material. The deposit can be composed of a non-woven material, which changes its dielectric properties only by absorbing the leak. The change in the measurable capacity of the deposit associated with it constitutes, in this case, the measure of the deposit's saturation by leakage. When measuring capacity, it is possible to draw conclusions about the amount of fluid leakage in the tank. Summary of the Invention
    [0006] The object of the invention is to further develop a preliminary seal, a preliminary seal arrangement and a seal ring, which comprises the preliminary seal in such a way that an electrostatic charge and resulting damage to the elements of the machine to be sealed in relation to each other are prevented by the preliminary seal.
    [0007] The object is achieved by the characteristics of embodiments 1, 18 and 21. The dependent embodiments, respectively, refer to advantageous modalities.
    [0008] To reach the object, a preliminary seal is provided, which comprises a disk, which is configured to be substantially annular and is made of an electrically conductive and air-permeable material, and a support body, in which the disc - in relation to the conveyor body - is configured as an individual piece produced separately and is connected to the conveyor body. With the preliminary seal, an electrically conductive connection and, therefore, an equalization of electrical potential between the elements of the machine to be sealed in relation to each other is obtained. In this case, the elements of the machine to be sealed in relation to each other can be formed, for example, through an axis and a housing, through which the axis is guided. The preliminary seal causes a controlled electric potential equalization between the machine elements.
    [0009] As a result, mechanical damage to the machine elements by an electrostatic charge from one of the machine elements and a subsequent voltage puncture to the other machine element, which has a different electrical potential, is prevented. In the preliminary seal arrangement, one of the machine elements is grounded to a defined earth potential (for example, the body of a motor vehicle as an electrical earth potential), so that a potential equalization with the other element of the machine is achieved as a result of the electrically conductive preliminary seal.
    [00010] The preliminary seal is a dissociated electric bridge. “Dissociated” is understood in this context to mean that the sealing function of, for example, a sealing ring combined with the preliminary seal is dissociated from the electric bridge function, that is, to avoid a voltage puncture and to perform a equalization of electrical potential between machine elements. The preliminary seal is not in direct contact with the medium to be sealed. The advantage of this is that the electrical resistance of the preliminary seal is substantially constant throughout the service life of the preliminary seal. If the preliminary seal comes into contact with the medium to be sealed, the resistance would then change uncontrollably.
    [00011] The material of which the disk is composed is not only electrically conductive, but it is also permeable to air. Air permeability is achieved as a result of an open porosity of the material, of which the disc is composed. As a result, the preliminary seal exhibits only minimal radial force, with which it touches the elements of the machine to be sealed in relation to each other in a well-adjusted manner. As a result of the material's air permeability, it is possible for pressure equalization to occur axially on both sides of the preliminary seal, such that the preliminary seal can easily be used in combination with a seal ring, even when excessive pressure relative or relative negative pressure forms on an axial side of the preliminary seal during proper use. The preliminary seal, due to its air permeability, makes a pressure equalization axially on both sides. In addition, it is advantageous that, due to the minimum frictional force, the frictional moment and, therefore, the wear of the preliminary seal is only insignificant. In such a case, the material's air permeability must correspond to or exceed, at least, the air-carrying capacity of the radial shaft seal ring. For example, a radial shaft sealing ring of FKM material for a shaft that has a diameter of 85 millimeters transmits at 40 ° C and at 4,000 rpm at about 10 ml of air per second.
    [00012] According to an advantageous modality, it can be predicted that the disc has an electrical resistance, which is <100Q, more preferably <10Q.
    [00013] To adjust it will say resistance destined to remain constant throughout the useful life, the dissociation between the preliminary seal from the seal of the medium to be sealed, as explained previously, is of crucial importance.
    [00014] The resistances mentioned above can be achieved with the materials and disk configurations explained below. If, for example, a seal ring, specifically a radial shaft seal ring, is used together with the preliminary seal, the radial shaft seal ring sealing disc and shoulder exhibit different materials from each other. The preliminary seal, in this case, is essentially an electrical conductor, secondarily a preliminary seal.
    [00015] The advantage of the scale of the aforementioned resistors is that they cover the range of less than 100 Ohm. For other specific uses, however, these can also be adjusted in the range less than 10 Ohm.
    [00016] The carrier body can, for example, be formed by a support ring, which is composed of a hard and resistant material. The support ring can, for example, be composed of a metal or a polymer material. In such a case, the disk is indirectly or directly connected to the support ring, in which said preliminary seal can be combined with the seal rings in a modular configuration. The disk is kept in its mounting space by the support ring.
    [00017] According to another modality, it is possible that the carrier body is formed by a sealing ring. In such a case, the disk and the sealing ring can form a pre-assembled unit. The seal ring can, for example, be configured as a radial shaft seal ring.
    [00018] An option to connect the disc and the carrier body consists of adhesively joining the two parts mentioned above to each other. An adhesive bond is easy to implement and cost-effective.
    [00019] The material, of which the disk is composed, can be formed by a non-woven material. Non-woven materials fulfill the above mentioned requirements especially well; they can be produced / assembled and designed to be sufficiently air permeable and sufficiently electrically conductive.
    [00020] For an equalization of electrical potential between machine elements, that is, to avoid an electrostatic charge with subsequent tension puncture, non-woven materials with fibers that have a fiber length of 2 mm to 200 mm have proved to be especially reliable. Said a material has excellent electrical conductivity.
    [00021] According to another advantageous modality, it can be predicted that the non-woven material has a mass per unit area of 20 g / m2 to 200 g / m2. These nonwoven materials have advantageously small radial strength, good electrical conductivity and are sufficiently air permeable. The low radial pressure force minimizes the formation of frictional heat, even at speeds up to 25,000 min-1. Wear related to the operation of non-woven materials that have the aforementioned fiber length and the mass per unit area mentioned above is particularly minimal.
    [00022] A particular advantage of discs composed of a non-woven material, as opposed, for example, to the known brush rotors, is found, in this case, in the orientation of the quasi-isotropic fiber in non-woven materials as opposed to brushes. As a result, fibers from non-woven materials, unlike brushes, contact the machine elements to be sealed at various contact angles. In brushes, the end of the fibers is usually oriented perpendicularly only to the surface of the machine element to be sealed, comparable to a pin on a disk. On the other hand, the fibers of non-woven materials also include radial tangential segments that are aligned, flattened, so to speak, against the axis by a wide area, so that the disc composed of non-woven material - has very low contact resistances - despite radial radial pressure forces. This contact over a wide area allows for a particularly effective potential equalization between the machine elements, among which the preliminary seal is arranged.
    [00023] According to another modality, the material, of which the disk is composed, can be formed by a fabric. The advantage of a mesh over a non-woven material is that, unlike the non-woven material, the length of the fibers of the mesh can be further increased further. In this case, however, an almost isotropic orientation is only possible when using multilayer laminates, which have economic disadvantages.
    [00024] The material may include electrically conductive particles. Such particles can, for example, be formed of carbon fibers or metallic particles, in particular metallic wires.
    [00025] The advantage of using particles made of carbon fibers which is, in this case, the excellent electrical conductivity is linked to the superior elasticity, which the non-woven disc, in the form of a multilayer spring, continuously applies to the shaft with the smallest possible radial forces.
    [00026] In contrast, metal wires are used in the form of electrically conductive particles, for example, when strongly oxidizing environmental conditions are expected. In this case, however, the resilience is somewhat reduced, and potential adhesive or abrasive wear is disadvantageous.
    [00027] Other improved functional properties of the preliminary seal occur when the disc also has an impregnation of a PTFE dispersion. This is surprising, since PTFE is known to be a poor electrical conductor and, despite this, the conductivity of the non-woven material is improved as a result of impregnation.
    [00028] The improvement in electrical conductivity as a result of the dispersion of PTFE is presumably due to the fact that, during impregnation, the dispersion is charged into the interstitial spaces of the non-woven material and, after drying, the electrically conductive fibers of the material Non-woven fabrics remain bonded longer.
    [00029] In ready-to-use condition, the disc may have a calendered thickness, which is equivalent to 25% to 95% of the initial thickness related to production.
    [00030] When calendering, it should be noted that the non-woven material is not excessively solidified; air permeability must be maintained for the functional properties described above. If, after being impregnated with the PTFE dispersion, the non-woven material is subjected to a calendering process, the contact with the fibers in the non-woven material is further reinforced and permanently sealed. As a result of calendering, the wear resistance of the non-woven material is improved, so that the disc, and therefore the entire preliminary seal, consistently exhibits good functional properties over a long service life.
    [00031] Alternatively, a wax dispersion can be used as another type of bond and, optionally, fillers can be introduced for additional functionality, for example, through impregnation, on the disc.
    [00032] The preliminary seal arrangement includes a preliminary seal, as described above, in which the disc of the preliminary seals touches a seal in a well-fitting manner and a surface to be sealed from a first machine element to be sealed, where the first machine element to be sealed is arranged with a radial spacing, so as to be adjacent to a second machine element, where the disc is placed in the opening formed by the radial spacing, where the second machine element is grounded to a defined earth potential, where the second machine element is touched by the disc in a well-adjusted manner and where, as a result, the first machine element and the second machine element are interconnected in a way electrically conductive. As a result of an electrically conductive connection of the two machine elements via the electrically conductive disk, an equalization of electrical potential is created between the two machine elements, and mechanical damage to the machine elements as a result of a voltage puncture is prevented .
    [00033] In the preliminary seal arrangement, one of the machine elements is grounded, so that, as a result of potential equalization, the other machine element is also grounded. As a result of the equalization of electrical potential and the grounding of the preliminary seal arrangement, mechanical damage to the machine elements caused by voltage punctures is avoided.
    [00034] Without electrical potential equalization, mechanical damage to the machine elements to be sealed in relation to each other caused by voltage punctures can occur as a result of highly variable electrical potentials of the machine elements being equalized by a voltage puncture electrical. Such a puncture of tension is all the more likely, as closer the machine elements with different electrical potentials are arranged to each other. Such a tension puncture can cause a removal of material on the machine element, which has a relatively low rate, and a change in the material structure in the area in which the tension puncture occurs.
    [00035] In the production-related state, the disc may exhibit an overlap with the machine elements to be electrically connected to each other and to be sealed from each other, totaling 0.5 mm to 5 mm. Such an overlap is advantageously tried and tested with respect to good electrical conductivity. An undesirably high pressure force and, as a result, undesirably high friction heat and high wear are minimized as a result.
    [00036] The first machine element can be formed by a drive shaft of an electric motor, the second machine element can be formed by a transmission housing connected to the electric motor and which involves the drive shaft. This specific use of the preliminary sealing arrangement is particularly advantageous. When the electric motor and the transmission together form a drive unit, this usually results in a static load of individual components of the drive unit, due to the operation of the electric motor and, therefore, potential differences between the components, which are not statically charged.
    [00037] In general, there is the possibility of inducing potential equalization between components having different potentials using relatively expensive construction measures. In the preliminary seal arrangement according to the invention, this potential equalization is achieved through the preliminary seal according to the invention, which is simple in design and is simple to produce and low cost. During proper use of an electric motor, the drive shaft can be electrostatically charged. The drive shaft of the electric motor extends to a transmission adjacent to an electric motor. Without a potential equalization, there would be a danger of a voltage puncture occurring between the electrostatically charged drive shaft, and transmission components and machine elements of the transmission being mechanically damaged as a result of a puncture voltage. To avoid this, it is provided according to the invention that potential equalization is achieved as a result of the preliminary seal according to the invention. The electrostatic charge of the drive shaft is discharged with the aid of the disc, which is composed of an electrically conductive and air-permeable material, for example, a non-woven material or a mesh, on the adjacent machine element, which is grounded to a defined earth potential. Thus, the drive shaft is also grounded. Because there is no potential difference between the drive shaft and the adjacent components of the transmission, a voltage puncture may also not occur, which could result in mechanical damage.
    [00038] In addition, the invention relates to a sealing ring, which comprises at least one dynamically tensioned sealing lip and a preliminary seal, which is arranged axially spaced adjacent the sealing lip. The sealing lip can be composed of an elastomeric material.
    [00039] The seal ring may comprise at least one dynamically tensioned seal shoulder and at least one statically tensioned seal. The dynamically tensioned sealing shoulder may, for example, include a shaft to be sealed, and the seal may touch the hole of a housing in a sealing manner.
    [00040] To reach the object, it is provided that the preliminary seal of the sealing ring is composed of an electrically conductive non-woven material and permeable to air.
    [00041] It is advantageous, in this case, that the preliminary seal of the seal ring establishes an electrically conductive connection between the machine elements to be sealed in relation to each other, and thus causes an equalization of electrical potential between the elements of the machine. As a result, mechanical damage to the machine element resulting from an electrical voltage puncture is prevented. In addition to equalizing electrical potential, the preliminary seal protects the sealing lip from being impacted by environmental contaminants.
    [00042] The air permeability of the preliminary seal prevents the occurrence of disadvantageous pressure differences axially on both sides of the disc, for example, even when the temperatures in the environment and in the space to be sealed change in relation to the other.
    [00043] The sealing lip can be composed of an elastomeric material. Elastomeric materials such as sealing materials for sealing shoulder are generally known, in which a wide variety of materials are available for a wide variety of uses. For many applications, elastomeric materials are available at favorable prices and are easy to process.
    [00044] A dirt shoulder can be arranged between the sealing shoulder and the primary seal disc. Said dirt shoulder forms an additional protection against the intrusion of contaminants from the environment towards the sealing lip. Contaminants, which have passed the sealing disc of the preliminary seal towards the sealing lip, are then retained by the dirt lip. The preliminary seal and the dirt shoulder are arranged in a functional series connection. According to an advantageous embodiment, it can be predicted that the dirt shoulder and the sealing shoulder are integrally formed by merging with each other and with the same material. The production of the seal ring is simplified as a result. Depending on the respective application circumstances, however, it may also be possible for the dirt shoulder and the sealing shoulder to be composed of different sealing materials from each other. In this way, each of the shoulders can be adapted, functionally individualized to the respective tasks. BRIEF DESCRIPTION OF THE DRAWINGS
    [00045] Two exemplary embodiments of the claimed preliminary seal arrangement having the claimed preliminary seal are schematically represented in Figures 1 and 2 and are described in greater detail below, in which:
    [00046] Fig. 1 shows a first exemplary embodiment, in which the carrier body of the preliminary seal is formed by a sealing ring of the radial shaft, in which the disc is connected to the sealing ring of the radial shaft,
    [00047] Fig. 2 shows a second exemplary embodiment, in which the carrier body is formed by a support ring, in which the support ring and the disc are arranged on the side of a sealing ring of the radial axis turned axially outwards from the space to be sealed. DETAILED DESCRIPTION OF THE INVENTION
    [00048] Figures 1 and 2 each show a preliminary seal arrangement according to the invention, which comprises a preliminary seal according to the invention. The preliminary seal is disposed within the space 13 between the first machine element 10 and the second machine element 12, in which the opening is formed by a radial spacing 11.
    [00049] The first machine element 10 is formed by the axis of a supply unit, the second machine element 12 is formed by the housing of the supply unit. The power unit can, for example, be an electric motor or a transmission. The shaft can be a motor shaft or a drive shaft.
    [00050] The preliminary seal comprises disk 1, which is configured to be substantially annular and is made of an electrically conductive and air-permeable material 2. In the exemplary embodiments shown here, this material 2 is composed of a non-woven material, which has fibers that have a fiber length of 2 mm to 200 mm. The mass per unit area of the non-woven material is 20 g / m2 to 200 g / m2, and electrically conductive particles 7 are arranged in the non-woven material, which are formed in the exemplary form shown by carbon fibers. In addition, each of the disks 1 in one of the exemplary embodiments shown is provided with an impregnation 8 of a PTFE dispersion, wherein the thickness of the ready-to-use disks 1 shown here is approximately 50% of the initial thickness related to the production of the discs 1.
    [00051] The electrical resistance of the discs is 1 <10Q.
    [00052] The disk 1 of the preliminary seal properly touches the surface 9 of the first element of the machine 10 to be sealed. The second element of the machine 12 is grounded to a defined earth potential, in which the second element of the machine 12 is also touched by the disc 1 in an adherent manner. Thus, the first machine element 10 and the second machine element 12 are interconnected in an electrically conductive manner through disk 1. In the production-related state, disk 1 has an overlap 14 with the machine elements (10, 12 ) which must be electrically interconnected and sealed in relation to each other, which is generally about 2.5 mm. As a result of the overlap 14, the radially inner and radially outer edge of the disc 1 of each faces outwardly in the axial direction, during proper use. Due to the electrically conductive interconnection between the first machine element 10 and the second machine element 12, as a result of disk 1, an equalization of electrical potential occurs between the two machine elements 10, 12. In addition to the equalization of electrical potential, the Preliminary seal also ensures that contaminants from the environment 17 are prevented from penetrating axially to the seal shoulder 15.
    [00053] In Figure 1, the carrier body 3 of the preliminary seal is formed by a sealing ring 5, which in this case is configured as a sealing ring of the radial shaft 6. The disk 1 and the sealing ring of the radial shaft 6 they are connected to each other on their sides axially facing each other. In this way, the preliminary seal and the sealing ring of the radial shaft 6 form a pre-assembled unit.
    [00054] In contrast, the carrier body 3 in Figure 2 is formed by a support ring 4, to which the disc 1 is also attached. A preliminary seal configured in this way can be combined in the form of a module with variously designed seal rings or can also be operated alone, in addition to a seal ring. [00055] Arranged between the sealing shoulder 15, which, in the exemplary embodiments shown, is composed of an elastomeric material, and the disc 1, is an axial spacing 16.
    权利要求:
    Claims (20)
    [0001]
    1. Preliminary seal comprising: an enclosure defining an axis hole, an axis received in the axis hole, and a disc (1), which is configured to be annular and is made of an electrically conductive and air-permeable material (2 ), and a carrier body (3), in which the disc (1) - in relation to the carrier body (3) - is configured as a separate part produced separately and is connected to the carrier body (3), in which the disc ( 1) comes into contact with both the casing and the shaft, in which the carrier body (3) is a sealing ring (5) with a radial shaft and characterized by the fact that the disc (1) has an air permeability that corresponds at least one air-carrying capacity of the radial shaft seal ring (5).
    [0002]
    2. Preliminary seal, according to claim 1, characterized by the fact that the disc (1) has an electrical resistance that is <100 Q.
    [0003]
    3. Preliminary seal, according to claim 1 or 2, characterized by the fact that the disc (1) has an electrical resistance that is <10 Q.
    [0004]
    Preliminary seal according to any one of claims 1 to 3, characterized in that the carrier body (3) is formed by a support ring (4) that is composed of a hard and resistant material.
    [0005]
    Preliminary seal according to any one of claims 1 to 3, characterized in that the carrier body (3) is formed by a sealing ring (5).
    [0006]
    6. Preliminary seal, according to claim 5, characterized by the fact that the sealing ring (5) is configured as a radial shaft sealing ring (6).
    [0007]
    Preliminary seal according to any one of claims 1 to 6, characterized in that the disc (1) and the carrier body (3) are adhesively bonded to each other.
    [0008]
    Preliminary seal according to any one of claims 1 to 7, characterized in that the material (2) of which the disc (1) is composed is formed by a non-woven material.
    [0009]
    9. Preliminary seal according to claim 8, characterized by the fact that the non-woven material has fibers having a fiber length of 2 mm to 200 mm.
    [0010]
    10. Preliminary seal, according to claim 8 or 9, characterized by the fact that the non-woven material has a mass per unit area of 20 g / m2 to 200 g / m2.
    [0011]
    11. Preliminary seal according to any one of claims 1 to 8, characterized in that the material (2) of which the disc (1) is composed is formed by a woven mesh.
    [0012]
    Preliminary seal according to any one of claims 1 to 11, characterized in that the material (2) comprises electrically conductive particles (7).
    [0013]
    13. Preliminary seal, according to claim 12, characterized by the fact that the particles (7) are formed by carbon fibers.
    [0014]
    14. Preliminary seal, according to claim 12, characterized by the fact that the particles (7) are configured so as to be metallic.
    [0015]
    15. Preliminary seal, according to claim 14, characterized by the fact that the particles (7) are formed by metal wires.
    [0016]
    16. Preliminary seal according to any one of claims 1 to 15, characterized in that the disc (1) has an impregnation (8) of a dispersion of PTFE.
    [0017]
    17. Preliminary seal according to any one of claims 1 to 16, characterized in that the disc (1) has a calender thickness that is 25% to 95% of the initial manufacturing-dependent thickness.
    [0018]
    18. Preliminary seal according to claim 1, characterized by the fact that the disc (1) of the preliminary seal touches in a sealed and well-adjusted manner a surface (9) to be sealed from a first machine element (10) to be sealed, in which the first machine element (10) to be sealed is arranged in a radial spacing (11) so as to be adjacent to a second machine element (12), in which the disc (1) is arranged in the opening (13) formed by the radial spacing (11), in which the second machine element (12) is grounded to a defined earth potential, in which the first machine element (10) and the second machine element (12 ) are played by the disc (1) in a well-adjusted mode and in which, by virtue of this fact, the first machine element (10) and the second machine element (12) are interconnected in an electrically conductive manner.
    [0019]
    19. Preliminary seal, according to claim 18, characterized by the fact that the disc (1) in the manufacturing dependent state has an overlap (14) of 0.5 mm to 5 mm with the machine elements (10, 12 ) that will be electrically interconnected and sealed against each other.
    [0020]
    20. Preliminary seal according to claim 18 or 19, characterized by the fact that the first machine element (10) is formed by a driving shaft of an electric motor, and the second machine element (12) is formed by a wrapper.
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    同族专利:
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    JP2016020739A|2016-02-04|
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    DE102014010269A1|2016-01-14|
    US20160010750A1|2016-01-14|
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    法律状态:
    2016-01-12| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2018-10-30| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-01-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-11-17| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application [chapter 6.1 patent gazette]|
    2021-02-17| B09A| Decision: intention to grant|
    2021-04-13| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 10/07/2015, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102014010269.6A|DE102014010269B4|2014-07-11|2014-07-11|Ballast seal, ballast seal arrangement and sealing ring, comprising the ballast seal|
    DE102014010269.6|2014-07-11|
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