US3033326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in friction material for a brake
Assignee: SK Wellman Corp
•
Filing: 1959-04-06
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Granted: 1962-05-08
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Expires: 1979-04-06
Abstract
No abstract record available.
Inventors
- 👤 Clifton A Byers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:43
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/027; F16D55/00; F16D55/24; F16D55/26; F16D55/36; F16D55/40; F16D2055/0004; F16D2055/0058
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A BRAKE HAVING ROTATABLE AND NONROTATABLE CO-OP ERATING BREAK ELEMENTS, ONE OF SAID ELEMENTS COMPRISING A BODY OF STEEL HAVING A FRICTION MATERIAL LAYER OF SINTERED COMPOSITION INCLUDING IRON AND MOUNTED DIRECTLY ON SAID BODY AND FUSED THERETO, A BLACK OXIDE COATING UPON AND WITHIN THE FRICTION MATERIAL LAYER, THE OTHER OF SAID COOPENING BREAK ELEMENTS BEING OF STEEL AND POSITIONED FOR FRICTIONAL ENGAGEMENT WITH THE BLACK OXIDE COATED FRICTION MATERIAL LAYER.
Claim 2
Dependent Claim
72 words
A BRAKE HAVING ROTATABLE AND NONROTATABLE CO-OP ERATING BREAK ELEMENTS, ONE OF SAID ELEMENTS COMPRISING A BODY OF STEEL HAVING A FRICTION MATERIAL LAYER OF SINTERED COMPOSITION INCLUDING IRON AND MOUNTED DIRECTLY ON SAID BODY AND FUSED THERETO, A BLACK OXIDE COATING UPON AND WITHIN THE FRICTION MATERIAL LAYER, THE OTHER OF SAID COOPENING BREAK ELEMENTS BEING OF STEEL AND POSITIONED FOR FRICTIONAL ENGAGEMENT WITH THE BLACK OXIDE COATED FRICTION MATERIAL LAYER.
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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) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |