US4384640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction material for clutch facings and the like
Assignee: RAYMARK Corp A CORP OF CT
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Filing: 1982-01-25
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Granted: 1983-05-24
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Expires: 2002-01-25
Abstract
Abstract Friction compositions consisting of aramid fibers bonded together with cured organic binders are disclosed. The compositions are particularly useful in the preparation of automotive clutch facings and brake linings.
Inventors
- 👤 James T. Trainor
- 👤 Stanley F. Covaleski
- 👤 John C. Adelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:45
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08K; C08K7/00; C08K7/02; C08L13/00; C08L21/00; C08L61/00; C08L61/04; C08L61/06; C08L7/00; C08L77/00; C08L77/10; F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; C08L77/06; Y; Y10; Y10T; Y10T428/00; Y10T428/21; Y10T428/213; Y10T442/00; Y10T442/30; Y10T442/3033; Y10T442/3041; Y10T442/3049; Y10T442/40; Y10T442/419
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
A clutch facing of improved resistance to wear comprising from about 5 to 60 percent of aramid fibers having a decomposition temperature of at least 850° F. bonded together with from about 40 to 95 percent of heat-hardenable cement comprising a thermosetting resin and a heat-curable elastomer, said percentages being by weight based on the combined weight of fibers and cement, said facing having been subjected to heat and pressure to consolidate said fibers and to cure said cement.
Claim 2
Dependent Claim
79 words
A clutch facing of improved resistance to wear comprising from about 5 to 60 percent of aramid fibers having a decomposition temperature of at least 850° F. bonded together with from about 40 to 95 percent of heat-hardenable cement comprising a thermosetting resin and a heat-curable elastomer, said percentages being by weight based on the combined weight of fibers and cement, said facing having been subjected to heat and pressure to consolidate said fibers and to cure said cement.
Claim 3
Dependent Claim
83 words
A disc brake pad of improved resistance to wear comprising from about 5 to about 60 percent of aramid fibers having a decomposition temperature of at least about 850° F. bonded together with from about 40 to about 95 percent of heat-hardenable cement comprising a thermosetting resin and a heat-curable elastomer, said percentages being by weight based on the combined weight of fibers and cement, said pad having been subjected to heat and pressure to consolidate said fibers and to cure said cement.
Claim 4
Dependent Claim
83 words
A disc brake pad of improved resistance to wear comprising from about 5 to about 60 percent of aramid fibers having a decomposition temperature of at least about 850° F. bonded together with from about 40 to about 95 percent of heat-hardenable cement comprising a thermosetting resin and a heat-curable elastomer, said percentages being by weight based on the combined weight of fibers and cement, said pad having been subjected to heat and pressure to consolidate said fibers and to cure said cement.
Claim 5
Dependent Claim
79 words
A brake lining of improved resistance to wear comprising from about 5 to 60 percent of aramid fibers having a decomposition temperature of at least 850° F. bonded together with from about 40 to 95 percent of heat-hardenable cement comprising a thermosetting resin and a heat-curable elastomer, said percentages being by weight based on the combined weight of fibers and cement, said lining having been subjected to heat and pressure to consolidate said fibers and to cure said cement.
Claim 6
Dependent Claim
79 words
A brake lining of improved resistance to wear comprising from about 5 to 60 percent of aramid fibers having a decomposition temperature of at least 850° F. bonded together with from about 40 to 95 percent of heat-hardenable cement comprising a thermosetting resin and a heat-curable elastomer, said percentages being by weight based on the combined weight of fibers and cement, said lining having been subjected to heat and pressure to consolidate said fibers and to cure said cement.
Claim 7
Dependent Claim
73 words
A composition for use in forming a friction element of improved resistance to wear comprising a mixture of from about 5 to about 60 percent of aramid fibers having a decomposition temperature of at least about 850° F. coated with from about 40 to about 95 percent of a heat-hardenable cement comprising a thermosetting resin and a heat-curable elastomer, said percentages being by weight based on the combined weight of fibers and cement.
Claim 8
Dependent Claim
73 words
A composition for use in forming a friction element of improved resistance to wear comprising a mixture of from about 5 to about 60 percent of aramid fibers having a decomposition temperature of at least about 850° F. coated with from about 40 to about 95 percent of a heat-hardenable cement comprising a thermosetting resin and a heat-curable elastomer, said percentages being by weight based on the combined weight of fibers and cement.
Claim 9
Dependent Claim
20 words
A composition according to claim 4 in which said mixture comprises from about 60 to about 80 percent heat-hardenable cement.
Claim 10
Dependent Claim
22 words
A composition according to claim 4 in which said aramid fibers are formed of the condensation product of terephthalic acid and p-phenylenediamine.
Claim 11
Dependent Claim
19 words
A composition according to claim 6 in which said aramid fibers have a decomposition temperature of about 930° F.
Claim 12
Dependent Claim
35 words
A composition according to claim 4 in which said heat-hardenable cement comprises from about 20 to 80 percent by weight of phenol formaldehyde resin and from about 80 to about 20 percent of natural rubber.
Claim 13
Dependent Claim
21 words
A composition according to claim 8 in which said heat-hardenable cement comprises about 50 percent of resin and 50 percent rubber.
Claim 14
Dependent Claim
21 words
A composition according to claim 4 in which said aramid fibers have a decomposition temperature of at least about 900° F.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |