Patent US3663497A successfully refreshed from Google Patents.
US3663497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction material
Assignee: Toyota Central R&D Labs Inc
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Filing: 1970-09-16
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Granted: 1972-05-16
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Expires: 1990-09-16
Abstract
Abstract AN IMPROVED FRICTION MATERIAL FOR FRICTION-ENGAGING MECHANISMS, SUCH AS AUTOMOTIVE BRAKES AND CLUCHES, COMPRISING ABOUT 30 TO 80% OF IRON OXIDE POWDER WHOSE MAIN INGREDIENT IS FERROSOFERRIC OXIDE, SUCH AS IRON SAND, ABOUT 15 TO 65% OF ORGANIC BINDER, AND THE BALANCE OF FILLERS AND ADDITIVES, WHEREBY TO IMPROVE WEAR, REDUCE DEFACEMENT AND PROVIDE A SUBSTANTIALLY CONSTANT COEFFICIENT OF FRICTION.
Inventors
- 👤 Kiyosha Ninomiya
- 👤 Hideaki Ohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:40
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; F; F16; F16D; F16D69/00; F16D69/02; F16D69/021; F16D69/022
Claims Analysis
Total Claims: 0
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |