Patent US2724671A successfully refreshed from Google Patents.
US2724671A
Expired / Lapsed
US
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Friction element and method of making the same
Assignee: Johns Manville Corp
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Filing: 1952-12-30
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Granted: 1955-11-22
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Expires: 1972-12-30
Abstract
No abstract record available.
Inventors
- 👤 Lombardy Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:08
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/021; F16D69/022
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
46 words
A METHOD OF MAKING A FRICTION ELEMENT COMPRISING, IMPREGNATING WIRE-REINFORCED FIBER YARN WITH A BINDER, DRYING AND CRIMPING THE IMPREGNATED YARN, ARRANGING A DESIRED QUANTITY OF THE CRIMPED YARN IN CONVOLUTIONS TO FORM A DISC OF THE DESIRED SIZE, COMPRESSING SAID DISC, AND CURING THE BINDER.
Claim 2
Independent Claim
46 words
A METHOD OF MAKING A FRICTION ELEMENT COMPRISING, IMPREGNATING WIRE-REINFORCED FIBER YARN WITH A BINDER, DRYING AND CRIMPING THE IMPREGNATED YARN, ARRANGING A DESIRED QUANTITY OF THE CRIMPED YARN IN CONVOLUTIONS TO FORM A DISC OF THE DESIRED SIZE, COMPRESSING SAID DISC, AND CURING THE BINDER.
Claim 3
Dependent Claim
30 words
A FRICTION ELEMENT COMPRISING CRIMPED WIRE-REINFORCED FIBER YARN DISPOSED IN CONVOLUTIONS DEFINING A DISC, SAID YARN BEING HELD IN THE FORM OF SAID DISC BY A HARD, CURED BINDER MATRIX.
Claim 4
Dependent Claim
30 words
A FRICTION ELEMENT COMPRISING CRIMPED WIRE-REINFORCED FIBER YARN DISPOSED IN CONVOLUTIONS DEFINING A DISC, SAID YARN BEING HELD IN THE FORM OF SAID DISC BY A HARD, CURED BINDER MATRIX.
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) | 1958-11-21 | 1959-05-23 | 1959-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-21 | 1963-05-23 | 1963-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-21 | 1967-05-23 | 1967-11-22 | $7700.00 | Window Closed / Lapsed |