Patent US3473637A successfully refreshed from Google Patents.
US3473637A
Expired / Lapsed
US
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Metal supported carbon friction disc
Assignee: Kennecott Corp
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Filing: 1968-08-09
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Granted: 1969-10-21
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Expires: 1988-08-09
Abstract
No abstract record available.
Inventors
- 👤 Richard D Rutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:37
CPC Classifications
F; F16; F16D; F16D55/00; F16D55/24; F16D65/00; F16D65/02; F16D65/12; F16D65/125; F16D65/126; F16D2055/0004; F16D2055/0058
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2388123A
Cited
GB642432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |