Patent US2581926A successfully refreshed from Google Patents.
US2581926A
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US
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Friction elements
Assignee: Bridgestone Firestone Inc
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Filing: 1946-10-18
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Granted: 1952-01-08
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Expires: 1966-10-18
Abstract
No abstract record available.
Inventors
- 👤 Frank J Groten
- 👤 Robert J Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:45
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/021; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31656
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
A COMPOSITE FRICTION ELEMENT COMPRISING A STEEL BACKING, AND A PHENOLIC RESIN ASBESTOS COMPOSITION FRICTION FACING ADHESIVELY SECURED THERETO BY MEANS OF A BONDING MEDIUM COMPRISING, BY WEIGHT, A CURED BUTADIENE-ACRYLONITRILETYPE ELASTOMER, 100 PARTS, AND A CURED PHENOLIC RESIN, 75-500 PARTS, SAID ELASTOMER BEING A COPOLYMER OF A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
52 words
A COMPOSITE FRICTION ELEMENT COMPRISING A STEEL BACKING, AND A PHENOLIC RESIN ASBESTOS COMPOSITION FRICTION FACING ADHESIVELY SECURED THERETO BY MEANS OF A BONDING MEDIUM COMPRISING, BY WEIGHT, A CURED BUTADIENE-ACRYLONITRILETYPE ELASTOMER, 100 PARTS, AND A CURED PHENOLIC RESIN, 75-500 PARTS, SAID ELASTOMER BEING A COPOLYMER OF A COMPOUND HAVING THE FORMULA
Claim 3
Independent Claim
63 words
THE METHOD WHICH COMPRISES SUPERPOSING A PHENOLIC RESIN ASBESTOS COMPOSITION FICTION FACING UPON A STEEL BACKING WITH A SELF-SUPPORTING ADHESIVE FILM HAVING A THICKNESS OF FROM .005 INCH TO .20 INCH INTERPOSED THEREBETWEEN, SAID FILM COMPRISING, BY WEIGHT, AN UNCURED BUTADIENDACRYLONITRILE-TYPE ELASTOMER, 100 PARTS, AND AN UNCURED THERMOSETTING PHENOLIC RESIN, 75-500 PARTS, SAID ELASTOMER BEING A COPOLYMER OF A COMPOUND HAVING THE FORMULA
Claim 4
Independent Claim
63 words
THE METHOD WHICH COMPRISES SUPERPOSING A PHENOLIC RESIN ASBESTOS COMPOSITION FICTION FACING UPON A STEEL BACKING WITH A SELF-SUPPORTING ADHESIVE FILM HAVING A THICKNESS OF FROM .005 INCH TO .20 INCH INTERPOSED THEREBETWEEN, SAID FILM COMPRISING, BY WEIGHT, AN UNCURED BUTADIENDACRYLONITRILE-TYPE ELASTOMER, 100 PARTS, AND AN UNCURED THERMOSETTING PHENOLIC RESIN, 75-500 PARTS, SAID ELASTOMER BEING A COPOLYMER OF A COMPOUND HAVING THE FORMULA
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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) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |