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US2637307A
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Internal-combustion engine
Assignee: Individual
•
Filing: 1948-08-05
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Granted: 1953-05-05
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Expires: 1968-08-05
Abstract
No abstract record available.
Inventors
- 👤 Walton W Cushman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:09
CPC Classifications
F; F02; F02M; F02M25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US911345A
Cited
US1440956A
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US1453560A
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US1459794A
Cited
US2099802A
Cited
US2300774A
Cited
US2354179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |