US3572281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Watercraft
Assignee: Schottel GmbH and Co KG
•
Filing: 1968-12-23
•
Granted: 1971-03-23
•
Expires: 1988-12-23
Abstract
Abstract A WATERCRAFT HAVING A PAIR OF SUBSTANTIALLY PARALLEL, LONGITUDINALLY ARRANGED, RECESSES OR TUNNELS POSITIONED BELOW THE WATERLINE IN THE AFTER PORTION OF ITS HULL AND A SUITABLY DRIVEN PROPELLER LOCATED WITHIN EACH RECESS AND MOUNTED FOR PIVOTING AROUND A VERTICAL AXIS. FLAPS CLOSE THE AFTER END OF SAID RECESSES WHEN THE CRAFT IS OPERATING IN REVERSE AND THE ENGINE IS PEREFERABLY PLACED FORWARDLY OF THE FORWARD END OF SAID RECESSES.
Inventors
- 👤 Josef Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:05
CPC Classifications
B; B63; B63H; B63H5/00; B63H5/07; B63H5/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |