US3179078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual hydrofoil mechanism for sailboats
Assignee: Individual
•
Filing: 1962-12-04
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Granted: 1965-04-20
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Expires: 1982-12-04
Abstract
No abstract record available.
Inventors
- 👤 John R Popkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:19
CPC Classifications
B; B63; B63B; B63B39/00; B63B39/06; B63B39/062; B63B1/00; B63B1/16; B63B1/24; B63B1/28; B63B1/30; B63H; B63H9/00; B63H9/04; B63B2039/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
AN APPARATUS FOR A SAILBOAT, COMPRISING, A PAIR OF HYDROFOILS PIVOTALLY MOUNTED ON THE SAILBOAT AT LATERALLY SPACED LOCATIONS ON EITHER SIDE OF THE LONGITUDINAL CENTER LINE OF THE SAILBOAT, SAID HYDROFOILS HAVING ASYMMETRICAL SHAPE FOR PRODUCING A LATERAL FORCE WHEN PASSING THROUGH THE WATER, MEANS FOR AUTOMATICALLY PIVOTING EACH OF SAID HYDROFOILS SOLELY IN RESPONSE TO WIND IMPINGING ON THE SAILBOAT TO RAISE THE WINDWARD SIDE HYDROFOIL OUT OF THE WATER AND TO LOWER THE LEEWARD SIDE HYDROFOIL INTO THE WATER, MEANS FOR FURTHER PIVOTING SAID LEEWARD SIDE HYDROFOIL IN RESPONSE TO WIND FORCES TO ANGULARLY POSITION THAT HYDROFOIL IN THE WATER SUCH THAT THEM SAID LATERAL FORCE PRODUCED BY SAID ASYMMETRICAL SHAPE RESISTS BOTH SIDEWAYS SLIPPING AND OVERTURNING FORCES IMPOSED ON THE SAILBOAT BY THE WIND.
Claim 2
Independent Claim
128 words
AN APPARATUS FOR A SAILBOAT, COMPRISING, A PAIR OF HYDROFOILS PIVOTALLY MOUNTED ON THE SAILBOAT AT LATERALLY SPACED LOCATIONS ON EITHER SIDE OF THE LONGITUDINAL CENTER LINE OF THE SAILBOAT, SAID HYDROFOILS HAVING ASYMMETRICAL SHAPE FOR PRODUCING A LATERAL FORCE WHEN PASSING THROUGH THE WATER, MEANS FOR AUTOMATICALLY PIVOTING EACH OF SAID HYDROFOILS SOLELY IN RESPONSE TO WIND IMPINGING ON THE SAILBOAT TO RAISE THE WINDWARD SIDE HYDROFOIL OUT OF THE WATER AND TO LOWER THE LEEWARD SIDE HYDROFOIL INTO THE WATER, MEANS FOR FURTHER PIVOTING SAID LEEWARD SIDE HYDROFOIL IN RESPONSE TO WIND FORCES TO ANGULARLY POSITION THAT HYDROFOIL IN THE WATER SUCH THAT THEM SAID LATERAL FORCE PRODUCED BY SAID ASYMMETRICAL SHAPE RESISTS BOTH SIDEWAYS SLIPPING AND OVERTURNING FORCES IMPOSED ON THE SAILBOAT BY THE WIND.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |