Patent US3673276A successfully refreshed from Google Patents.
US3673276A
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Friction elements
Assignee: PepsiAmericas Inc
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Filing: 1970-02-12
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Granted: 1972-06-27
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Expires: 1990-02-12
Abstract
Abstract A friction element comprising fillers in an organic binder is prepared from a binder comprising a thermosetting phenolformaldehyde resin, a polymer of cashew nut shell liquid, and a Buna-N rubber. The rubber is to have an acrylonitrile content exceeding a specified limit measured in terms of nitrogen content, namely, upward of 9.8 percent nitrogen.
Inventors
- 👤 Emil C Keller
- 👤 Raymond E Spokes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:48
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/021; C; C08; C08L; C08L61/00; C08L61/04; C08L61/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A method according to claim 1 in which the ratio of rubber: polymer:phenolic complex is about 1:0.75:6 and wherein the complex is present in an amount of not more than about 20 percent by weight of the mixture as a whole.
Claim 2
Dependent Claim
25 words
A method according to claim 1 in which the Buna-N rubber has a nitrogen content of about 10.6 percent and up to about 12 percent.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |