US3087452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrofoils
Assignee: Individual
•
Filing: 1961-02-07
•
Granted: 1963-04-30
•
Expires: 1981-02-07
Abstract
No abstract record available.
Inventors
- 👤 Grimston Francis Bri Sylvester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:38
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/16; B63B1/24; B63B1/248
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A HYDROFOIL AND STABILISING DEVICE FOR A BOAT, HAVING A LOWER SUPPORTING HYDROFOIL AND AN UPPER SENSING HYDROFOIL RIGIDLY CONNECTED THERETO AND IN ADVANCE THEREOF, A PIVOT SECURED ON THE UNDERSIDE OF THE BOAT HULL AND EXTENDING TRANSVERSELY BETWEEN SAID HYDROFOILS, ABOUT WHICH THEY ARE MOUNTED FOR ROTATIONAL MOVEMENT, AND STOPS ON THE DEVICE LIMITING SUCH MOVEMENT TO ABOUT 20*, BETWEEN THE NORMAL HYDROFOILING POSITION OF THE SUPPORTING HYDROFOIL AND ITS MAXIMUM LIFTING POSITION, IN WHICH DEVICE, THE SUPPORTING HYDROFOIL CONSTITUTES THE LOWER PORTION OF A SHORT TUBULAR ELEMENT ROCKABLY MOUNTED ABOUT A TRANSVERSE AXIS WITHIN THE ELEMENT, AND THE SENSING HYDROFOIL CONSTITUTES THE UPPER PORTION OF SAID ELEMENT, THE LEADING EDGE OF SAID UPPER PORTION LYING FORWARDLY OF THE LEADING EDGE OF THE LOWER PORTION.
Claim 2
Dependent Claim
126 words
A HYDROFOIL AND STABILISING DEVICE FOR A BOAT, HAVING A LOWER SUPPORTING HYDROFOIL AND AN UPPER SENSING HYDROFOIL RIGIDLY CONNECTED THERETO AND IN ADVANCE THEREOF, A PIVOT SECURED ON THE UNDERSIDE OF THE BOAT HULL AND EXTENDING TRANSVERSELY BETWEEN SAID HYDROFOILS, ABOUT WHICH THEY ARE MOUNTED FOR ROTATIONAL MOVEMENT, AND STOPS ON THE DEVICE LIMITING SUCH MOVEMENT TO ABOUT 20*, BETWEEN THE NORMAL HYDROFOILING POSITION OF THE SUPPORTING HYDROFOIL AND ITS MAXIMUM LIFTING POSITION, IN WHICH DEVICE, THE SUPPORTING HYDROFOIL CONSTITUTES THE LOWER PORTION OF A SHORT TUBULAR ELEMENT ROCKABLY MOUNTED ABOUT A TRANSVERSE AXIS WITHIN THE ELEMENT, AND THE SENSING HYDROFOIL CONSTITUTES THE UPPER PORTION OF SAID ELEMENT, THE LEADING EDGE OF SAID UPPER PORTION LYING FORWARDLY OF THE LEADING EDGE OF THE LOWER PORTION.
References Cited (Backward Citations)
US857951A
Cited
US1976046A
Cited
US2387907A
Cited
GB582985A
Cited
US2603179A
Cited
FR1179702A
Cited
US2972974A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |