Patent US2312722A successfully refreshed from Google Patents.
Patent US2504137A successfully refreshed from Google Patents.
US2504137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airplane propulsion and stabilizing device
Assignee: Individual
•
Filing: 1942-08-24
•
Granted: 1950-04-18
•
Expires: 1962-08-24
Abstract
No abstract record available.
Inventors
- 👤 William L Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:11
CPC Classifications
B; B64; B64C; B64C39/00; B64C39/10; B64C11/00; B64C11/001; B64C11/46; B64C11/48; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1942674A
Cited
US1037658A
Cited
US1160021A
Cited
US1386493A
Cited
US1270649A
Cited
US1862102A
Cited
US1564354A
Cited
US1516295A
Cited
US1624475A
Cited
US1847094A
Cited
US1782072A
Cited
US1859807A
Cited
US1929778A
Cited
US1880520A
Cited
US1810762A
Cited
US1972190A
Cited
US1970565A
Cited
US1968227A
Cited
US2060387A
Cited
US2111318A
Cited
US2132529A
Cited
US2081832A
Cited
GB472555A
Cited
US2194596A
Cited
US2113692A
Cited
US2169243A
Cited
US2191842A
Cited
US2140783A
Cited
US2272626A
Cited
US2164545A
Cited
US2219980A
Cited
GB499004A
Cited
US2242198A
Cited
GB504539A
Cited
US2160281A
Cited
US2274442A
Cited
US2233031A
Cited
US2396911A
Cited
US2286908A
Cited
US2312473A
Cited
US2388247A
Cited
GB546588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |