US2910449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake shoe composition of phenol-form-aldehyde resin, an unvulcanized rubber, asbestos fiber, iron chips, and carbon black and method of making same
Assignee: Westinghouse Air Brake Co
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Filing: 1957-02-25
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Granted: 1959-10-27
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Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 John B Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:30
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/021; F16D69/022; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K3/08; C08K7/00; C08K7/02; C08K7/04; C08K7/10; C08K7/12; C08L; C08L61/00; C08L61/04; C08L61/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A METHOD OF MAKING A COMPOSITION FRICTION MATERIAL HAVING CHARACTERISTICS MAKING IT ESPECIALLY SUITABLE FOR USE AS A FRICTION MATERIAL FOR A BRAKE SHOE, WHICH METHOD COMPRISES MOLDING UNDER HEAT AND PRESSURE A MIXTURE CONSISTING OF, BY WEIGHT, 4 TO 10% UNVULCANIZED BUTADIENE-ACRYLONITRILE COPOLYMER SYNTHETIC RUBBER, 8 TO 15% PHENOL-FORMALDEHYDE RESIN 12 TO 20% ASBESTOS FIBER. 60 TO 75% CAST IRON CHIPS AND UP TO 5% CARBON BLACK.
Claim 2
Independent Claim
68 words
A METHOD OF MAKING A COMPOSITION FRICTION MATERIAL HAVING CHARACTERISTICS MAKING IT ESPECIALLY SUITABLE FOR USE AS A FRICTION MATERIAL FOR A BRAKE SHOE, WHICH METHOD COMPRISES MOLDING UNDER HEAT AND PRESSURE A MIXTURE CONSISTING OF, BY WEIGHT, 4 TO 10% UNVULCANIZED BUTADIENE-ACRYLONITRILE COPOLYMER SYNTHETIC RUBBER, 8 TO 15% PHENOL-FORMALDEHYDE RESIN 12 TO 20% ASBESTOS FIBER. 60 TO 75% CAST IRON CHIPS AND UP TO 5% CARBON BLACK.
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) | 1962-10-26 | 1963-04-27 | 1963-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-26 | 1967-04-27 | 1967-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-26 | 1971-04-27 | 1971-10-27 | $7700.00 | Window Closed / Lapsed |