US2821271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid cooled brake with copper friction surfaces
Assignee: ERLING D SEDERGREN
•
Filing: 1954-05-03
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Granted: 1958-01-28
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Expires: 1974-05-03
Abstract
No abstract record available.
Inventors
- 👤 Roy S Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:28
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/78; F16D65/82; F16D65/833; F16D65/84; F16D65/853; F16D2065/784
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US464949A
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US1935713A
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US1978687A
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US2012662A
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US2299208A
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US2382570A
Cited
US2581941A
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US2664176A
Cited
US2682320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |