Patent US3237582A successfully refreshed from Google Patents.
US3237582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface piercing concave disc hydrofoil
Assignee: —
•
Filing: 1965-06-07
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Granted: 1966-03-01
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Expires: 1985-06-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:24
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/32; Y; Y02; Y02T; Y02T70/00; Y02T70/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN AT LEAST A WATERCRAFT HAVING A HULL, A PAIR OF DOWNWARDLY AND OUTWARDLY EXTENDING STRUTS SECURED TO SAID HULL WITH ONE STRUT ON EACH SIDE THEREOF, A SHAFT FREELY ROTATIVELY JOURNALED IN EACH STRUT AND EXTENDING DOWNWARDLY THEREFROM IN DIVERGING RELATION TO THE HULL, A DISC MOUNTED ON THE LOWER END OF EACH SHAFT, EACH DISC HAVING A CONCAVE LOWER SURFACE WITH THE AXIS OF ROTATION THEREOF CONVERGING UPWARDLY AND REARWARDLY IN RELATION TO THE BOAT HULL AND ALSO INWARDLY TOWARD THE CENTER THEREOF, WHEREBY THE WETTED SURFACES OF THE DISC WILL MOVE IN ROTATION WITH THE FLOW OF WATER REDUCING SKIN FRICTION.
Claim 2
Dependent Claim
104 words
IN AT LEAST A WATERCRAFT HAVING A HULL, A PAIR OF DOWNWARDLY AND OUTWARDLY EXTENDING STRUTS SECURED TO SAID HULL WITH ONE STRUT ON EACH SIDE THEREOF, A SHAFT FREELY ROTATIVELY JOURNALED IN EACH STRUT AND EXTENDING DOWNWARDLY THEREFROM IN DIVERGING RELATION TO THE HULL, A DISC MOUNTED ON THE LOWER END OF EACH SHAFT, EACH DISC HAVING A CONCAVE LOWER SURFACE WITH THE AXIS OF ROTATION THEREOF CONVERGING UPWARDLY AND REARWARDLY IN RELATION TO THE BOAT HULL AND ALSO INWARDLY TOWARD THE CENTER THEREOF, WHEREBY THE WETTED SURFACES OF THE DISC WILL MOVE IN ROTATION WITH THE FLOW OF WATER REDUCING SKIN FRICTION.
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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |