US3756910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction material and method of manufacture
Assignee: Johns Manville Corp
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Filing: 1971-06-24
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Granted: 1973-09-04
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Expires: 1991-06-24
Abstract
Abstract ARTICLE AND METHOD OF PREPARING CONTINUOUS GLASS FIBERS INTO A CONTINUOUS BUNDLE FOR THE USE IN FORMING FRICTION CLUTCH FACINGS. PLURAL ROVINGS (EACH CONTAINING MANY THOUSAND INDIVIDUAL CONTINUOUS GLASS FILAMENTS) ARE IMPREGNATED IN A CEMENT BATH, AND, AFTER PARTIAL DRYING, ARE COLLECTED AND CONTAINED IN A CONTINUOUS BUNDLE BY HELICALLY WRAPPING WITH A SOFT METAL WIRE. THEREAFTER THE BUNDLES ARE ADAPTED TO BE SPIRALLY WOUND UPON THEMSELVES INTO DISC-LIKE FORMS AND CURED UNDER HEAT AND PRESSURE TO DEFINE A FRICTION CLUTCH FACING.
Inventors
- 👤 W Peters
- 👤 Irvin Barnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:23
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/12; C03C25/16; B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/34; B29C70/347; B29C70/54; B29C70/542; F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; B29K; B29K2309/00; B29K2309/08; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249922; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2936
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |