US3085537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrofoil apparatus
Assignee: Individual
•
Filing: 1960-04-18
•
Granted: 1963-04-16
•
Expires: 1980-04-18
Abstract
No abstract record available.
Inventors
- 👤 Richard T Headrick
- 👤 Edward E Headrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:39
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/16; B63B1/24; B63B1/248; Y; Y02; Y02T; Y02T70/00; Y02T70/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A HYDROFOIL APPARATUS FOR PRODUCING LIFT BY MOTION IN A LIQUID MEDIUM COMPRISING A DELTA-SHAPED BODY MEMBER HAVING AN UPPER AND LOWER SURFACE WHICH CONVERGE TO FORM A PAIR OF THIN LEADING EDGES DISPOSED SYMMETRICALLY WITH RESPECT TO THE LONGITUDINAL AXIS OF THE BODY MEMBER AND INTERSECTING AT THE FRONT END THEREOF, THE LOWER SURFACE HAVING A CONCAVE PORTION TO FORM AT LEAST ONE CHANNEL RUNNING SUBSTANTIALLY THE LENGTH OF THE BODY MEMBER FOR INCREASING THE VELOCITY OF THE LIQUID FLOWING UNDER THE LOWER SURFACE TO THEREBY INCREASE THE LIFTING FORCE PRODUCED BY THE BODY MEMBER, THE BODY MEMBER BEING CONSTRUCTED SO THAT THE DISTANCE BETWEEN THE UPPER AND LOWER SURFACES INCREASES ALONG SUBSTANTIALLY EACH LONGITUDINAL CROSS SECTION FROM EACH OF THE LEADING EDGES TO THE REAR OF THE BODY MEMBER TO PRODUCE LARGE LIFTING FORCES ON THE LOWER SURFACE OF THE BODY MEMBER WITH SMALL RESULTANT DRAG FORCES ON THE UPPER SURFACE OF THE BODY MEMBER.
Claim 2
Dependent Claim
157 words
A HYDROFOIL APPARATUS FOR PRODUCING LIFT BY MOTION IN A LIQUID MEDIUM COMPRISING A DELTA-SHAPED BODY MEMBER HAVING AN UPPER AND LOWER SURFACE WHICH CONVERGE TO FORM A PAIR OF THIN LEADING EDGES DISPOSED SYMMETRICALLY WITH RESPECT TO THE LONGITUDINAL AXIS OF THE BODY MEMBER AND INTERSECTING AT THE FRONT END THEREOF, THE LOWER SURFACE HAVING A CONCAVE PORTION TO FORM AT LEAST ONE CHANNEL RUNNING SUBSTANTIALLY THE LENGTH OF THE BODY MEMBER FOR INCREASING THE VELOCITY OF THE LIQUID FLOWING UNDER THE LOWER SURFACE TO THEREBY INCREASE THE LIFTING FORCE PRODUCED BY THE BODY MEMBER, THE BODY MEMBER BEING CONSTRUCTED SO THAT THE DISTANCE BETWEEN THE UPPER AND LOWER SURFACES INCREASES ALONG SUBSTANTIALLY EACH LONGITUDINAL CROSS SECTION FROM EACH OF THE LEADING EDGES TO THE REAR OF THE BODY MEMBER TO PRODUCE LARGE LIFTING FORCES ON THE LOWER SURFACE OF THE BODY MEMBER WITH SMALL RESULTANT DRAG FORCES ON THE UPPER SURFACE OF THE BODY MEMBER.
References Cited (Backward Citations)
US1190755A
Cited
US1776700A
Cited
US1815303A
Cited
GB382812A
Cited
FR795223A
Cited
US2422388A
Cited
US2890672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-15 | 1966-10-15 | 1967-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-15 | 1970-10-15 | 1971-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-15 | 1974-10-15 | 1975-04-16 | $7700.00 | Window Closed / Lapsed |