US4051100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluoroelastomer-based composite material
Assignee: Caterpillar Inc
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Filing: 1975-07-14
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Granted: 1977-09-27
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Expires: 1995-07-14
Abstract
Abstract High modulus asperities are incorporated into a fluoroelastomer matrix to provide a material which, when cured, exhibits high, stable coefficients of friction over a wide temperature range.
Inventors
- 👤 Roger O. Bjerk
- 👤 William D. Brandon
- 👤 Frederick S. Engelking
- 👤 John Parker Jero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:36
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; C; C08; C08K; C08K3/00; C08K3/01; C08K3/013; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/252; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
As an article of manufacture a friction material formed of an elastomeric matrix comprising from about 20 to about 50% by weight of an elastomeric copolymer of hexafluoropropylene and vinylidene fluoride, and from about 12 to about 40% by weight of carbon black; and said friction material further containing from about 20 to about 60% by weight of glassy or ceramic asperite particles of from about 0.0001 to about 0.005 inch in effective diameter intermixed with and dispersed throughout said friction material in mechanically held nonbonded relation to provide a friction surface of said article of manufacture including the said matrix and said asperite particles.
Claim 2
Dependent Claim
105 words
As an article of manufacture a friction material formed of an elastomeric matrix comprising from about 20 to about 50% by weight of an elastomeric copolymer of hexafluoropropylene and vinylidene fluoride, and from about 12 to about 40% by weight of carbon black; and said friction material further containing from about 20 to about 60% by weight of glassy or ceramic asperite particles of from about 0.0001 to about 0.005 inch in effective diameter intermixed with and dispersed throughout said friction material in mechanically held nonbonded relation to provide a friction surface of said article of manufacture including the said matrix and said asperite particles.
Claim 3
Dependent Claim
103 words
A friction material composition consisting essentially of an elastomeric matrix having from about 20 to about 50% by weight of an elastomeric copolymer of hexafluoropropylene and vinylidene fluoride, and from about 12 to about 40% by weight of carbon black; and said friction material further consisting of from about 20 to abour 60% by weight of glassy or ceramic asperite particles having a minimum size of 0.0001 inch which are dispersed throughout the copolymer matrix in mechanically held nonbonded relation and assuring a relatively high surface concentration of the asperite particles to provide a friction surface material including said matrix and said particles.
Claim 4
Dependent Claim
103 words
A friction material composition consisting essentially of an elastomeric matrix having from about 20 to about 50% by weight of an elastomeric copolymer of hexafluoropropylene and vinylidene fluoride, and from about 12 to about 40% by weight of carbon black; and said friction material further consisting of from about 20 to abour 60% by weight of glassy or ceramic asperite particles having a minimum size of 0.0001 inch which are dispersed throughout the copolymer matrix in mechanically held nonbonded relation and assuring a relatively high surface concentration of the asperite particles to provide a friction surface material including said matrix and said particles.
Claim 5
Dependent Claim
40 words
A friction material composition as in claim 2 wherein said asperite particles are glass fibers of a size from about 0.0001 to about 0.005 inch in diameter and having a length to diameter ratio of from about 3 to 10,000.
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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |