US4384054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asbestos-free friction material
Assignee: Rain Carbon Germany GmbH
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Filing: 1981-10-01
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Granted: 1983-05-17
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Expires: 2001-10-01
Abstract
Abstract An asbestos-free friction material useful for brake linings, clutches, etc. comprising 5 to 25% by weight of a hardenable binder or binder mixture, a reinforcing fibrous material and conventional fillers, abrasives and lubricants the said reinforcing material consisting essentially of 1 to 50% by weight of diabase fibers with an average fiber length of 100 to 750 mu m and 1 to 44% by weight of metal fibers, metal wool or metal in the form of chips, powder or lamella, especially steel.
Inventors
- 👤 Klaus Moraw
- 👤 Hans-Gunther Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:00
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; C; C08; C08K; C08K13/00; C08K13/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
An asbestos-free friction material comprising 5 to 25% by weight of a hardenable binder or binder mixture, a reinforcing fibrous material and conventional fillers, abrasives and lubricants, the said reinforcing material consisting essentially of 1 to 50% by weight of diabase fibers with an average fiber length of 100 to 750 μm and 1 to 44% by weight of metal fibers, metal wool or metal lamella, chips or pieces.
Claim 2
Dependent Claim
69 words
An asbestos-free friction material comprising 5 to 25% by weight of a hardenable binder or binder mixture, a reinforcing fibrous material and conventional fillers, abrasives and lubricants, the said reinforcing material consisting essentially of 1 to 50% by weight of diabase fibers with an average fiber length of 100 to 750 μm and 1 to 44% by weight of metal fibers, metal wool or metal lamella, chips or pieces.
Claim 3
Dependent Claim
15 words
The material of claim 1 wherein the diabase fiber length is 150 to 350 micrometers.
Claim 4
Dependent Claim
19 words
The material of claim 1 or 2 wherein the diabase fibers are used in the form of fiber refuse.
Claim 5
Dependent Claim
15 words
The material of claim 3 wherein the reinforcing fibers are treated with an impregnating agent.
Claim 6
Dependent Claim
27 words
The material of claim 4 wherein the impregnating agent is selected from the group consisting of silanes, epoxides, nitrile rubbers, SBR rubber, phenolic resins and furan resins.
Claim 7
Dependent Claim
54 words
A method of preparing a friction brake lining comprising mixing aramide fibers metal fibers with an impregnating agent, admixing the latter with a hardenable binder mixture in the ratios of claim 1, placing the resulting mixture in a mold and compressing the mixture to form a brake lining and hardening the same by heating.
Claim 8
Dependent Claim
11 words
A friction brake lining produced by the process of claim 6.
Claim 9
Dependent Claim
10 words
The material of claim 1 wherein the metal is steel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |