Patent US3233574A successfully refreshed from Google Patents.
US3233574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Buoyancy device for a water surface craft
Assignee: Individual
•
Filing: 1964-06-16
•
Granted: 1966-02-08
•
Expires: 1984-06-16
Abstract
No abstract record available.
Inventors
- 👤 Justinien Marcel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:36
CPC Classifications
B; B63; B63H; B63H1/00; B63H1/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
AN BUOYANT DEVICE FOR A WATER SURFACE CRAFT, COMPRISING AT LEAST ONE HOLLOW SPIRAL SCREW MEMBER, AND A HOLLOW SCREW AXLE MEANS COAXIAL WITH SAID MEMBER AND HAVING SAID MEMBER FIXED THERETO FOR BEING MOUNTED ROTATABLY ON SAID CRAFT, SAID MEMBER PROVIDING A BUOYANCY FOR MAINTAINING SAID AXLE MEANS NORMALLY ABOVE WATER LEVEL DURING USE, SAID SCREW MEMBER INCLUDING TURNS HAVING A PITCH WHICH IS 2-3 TIMES THE MAXIMUM DIAMETER THEREOF, SAID SCREW MEMBER INCLUDING A CENTRAL PORTION WHEREIN
Claim 2
Dependent Claim
79 words
AN BUOYANT DEVICE FOR A WATER SURFACE CRAFT, COMPRISING AT LEAST ONE HOLLOW SPIRAL SCREW MEMBER, AND A HOLLOW SCREW AXLE MEANS COAXIAL WITH SAID MEMBER AND HAVING SAID MEMBER FIXED THERETO FOR BEING MOUNTED ROTATABLY ON SAID CRAFT, SAID MEMBER PROVIDING A BUOYANCY FOR MAINTAINING SAID AXLE MEANS NORMALLY ABOVE WATER LEVEL DURING USE, SAID SCREW MEMBER INCLUDING TURNS HAVING A PITCH WHICH IS 2-3 TIMES THE MAXIMUM DIAMETER THEREOF, SAID SCREW MEMBER INCLUDING A CENTRAL PORTION WHEREIN
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |