Patent US3509955A successfully refreshed from Google Patents.
US3509955A
Expired / Lapsed
US
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Propulsion unit
Assignee: Individual
•
Filing: 1967-11-24
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Granted: 1970-05-05
•
Expires: 1987-11-24
Abstract
No abstract record available.
Inventors
- 👤 William H Lichfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:57
CPC Classifications
B; B62; B62D; B62D51/00; B62D51/007; B62M; B62M27/00; B62M27/02; F; F16; F16K; F16K3/00; F16K3/02; F16K3/12; F16K3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1068883A
Cited
US1404882A
Cited
US2345496A
Cited
US2702088A
Cited
US2832426A
Cited
US2817536A
Cited
US2855059A
Cited
GB1402493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-04 | 1973-11-03 | 1974-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-04 | 1977-11-03 | 1978-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-04 | 1981-11-03 | 1982-05-05 | $7700.00 | Window Closed / Lapsed |