US2640795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction element and method of forming same
Assignee: Raybestos Manhattan Inc
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Filing: 1951-08-14
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Granted: 1953-06-02
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Expires: 1971-08-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Elmer C Bertolet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:09
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/021; F16D69/022; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1008; Y10T156/101
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
AN ENDLESS CLUTCH FACING COMPRISED OF A SPIRALLY WOUND STRIP OF THIN, FLEXIBLE, CONSOLIDATED AND CONDENSED CARDED LONG FIBER ASBESTOS WEB MATERIAL OF RELATIVELY HIGH POROSITY, THE FIBERS EXTENDING GENERALLY LONGITUDINALLY OF THE STRIP, SAID STRIP BEING LONGITUDINALLY FOLDED TO PROVIDE A SYMMETRICAL CROSS-SECTIONAL FORM AND THE COILS THEREOF BEING SECURED TOGETHER IN INTERNESTING RELATIONSHIP.
Claim 2
Dependent Claim
55 words
AN ENDLESS CLUTCH FACING COMPRISED OF A SPIRALLY WOUND STRIP OF THIN, FLEXIBLE, CONSOLIDATED AND CONDENSED CARDED LONG FIBER ASBESTOS WEB MATERIAL OF RELATIVELY HIGH POROSITY, THE FIBERS EXTENDING GENERALLY LONGITUDINALLY OF THE STRIP, SAID STRIP BEING LONGITUDINALLY FOLDED TO PROVIDE A SYMMETRICAL CROSS-SECTIONAL FORM AND THE COILS THEREOF BEING SECURED TOGETHER IN INTERNESTING RELATIONSHIP.
Claim 3
Independent Claim
81 words
THE METHOD OF FORMING A FRICTION ELEMENT SUITABLE FOR USE AS A CLUTCH FACING, WHICH COMPRISES IMPREGNATING A STRIP OF RELATIVELY THIN, POROUS, FLEXIBLE ASBESTOS SHEET MATERIAL COMPOSED OF CARDED AND CONDENSAED SPINNING GRADE ASBESTOS FIBERS SUBSTANTIALLY UNIFORMLY DISTRIBUTED AND DIRECTIONALIZED LONGITUDINALLY OF THE STRIP, WITH A HEAT-HARDENABLE BINDER-FRACTION MATERIAL FILLER COMPOSITION CEMENT, DRYING SOLVENT CONTENT FROM SAID CEMENT, CONVOLUTELY WINDING SAID STRIP MATERIAL TO FORM AN ANNULAR BODY, AND SUBJECTING SAID BODY TO HEAT AND PRESSURE TO CONSOLIDATE SAID STRIP.
Claim 4
Independent Claim
81 words
THE METHOD OF FORMING A FRICTION ELEMENT SUITABLE FOR USE AS A CLUTCH FACING, WHICH COMPRISES IMPREGNATING A STRIP OF RELATIVELY THIN, POROUS, FLEXIBLE ASBESTOS SHEET MATERIAL COMPOSED OF CARDED AND CONDENSAED SPINNING GRADE ASBESTOS FIBERS SUBSTANTIALLY UNIFORMLY DISTRIBUTED AND DIRECTIONALIZED LONGITUDINALLY OF THE STRIP, WITH A HEAT-HARDENABLE BINDER-FRACTION MATERIAL FILLER COMPOSITION CEMENT, DRYING SOLVENT CONTENT FROM SAID CEMENT, CONVOLUTELY WINDING SAID STRIP MATERIAL TO FORM AN ANNULAR BODY, AND SUBJECTING SAID BODY TO HEAT AND PRESSURE TO CONSOLIDATE SAID STRIP.
References Cited (Backward Citations)
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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) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |