US1386835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative counter-propeller for marine vessels
Assignee: Individual
•
Filing: 1920-01-24
•
Granted: 1921-08-09
•
Expires: 1940-01-24
Abstract
No abstract record available.
Inventors
- 👤 Birkett Ralph Whitehead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:12
CPC Classifications
B; B63; B63H; B63H1/00; B63H1/02; B63H1/12; B63H1/14; B63H1/28; B63B; B63B3/00; B63B3/14; B63B3/40; B63H5/00; B63H5/07; B63H5/08; B63H5/10; B63H2005/106
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1924-08-08 | 1925-02-07 | 1925-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-08-08 | 1929-02-07 | 1929-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-08-08 | 1933-02-07 | 1933-08-09 | $7700.00 | Window Closed / Lapsed |