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Patent US4453484A successfully refreshed from Google Patents.
US4453484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hull of a boat, provided with keel and rudder
Assignee: Individual
•
Filing: 1981-10-30
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Granted: 1984-06-12
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Expires: 2001-10-30
Abstract
Abstract A hull (8) of a boat, having a keel (9) and a rudder (10). Both the rudder and the keel can be swung about an axis (14) extending in the longitudinal direction of the hull.
Inventors
- 👤 Erik Englund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:27
CPC Classifications
B; B63; B63B; B63B41/00; B63H; B63H25/00; B63H25/06; B63H25/38; B63H25/382; B63B35/00; B63B2035/009; B63B39/00; B63B39/06; B63B2039/065
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
99 words
A combined keel and rudder for a sail boat having a hull, including: a keel mounted on the hull for rotation of the keel about an axis extending in the longitudinal direction of the hull, a rudder mounted on the keel for rotation about said axis extending in the longitudinal direction of the hull, and means for swinging the keel and rudder in unison to selected positions on either side of said axis extending in the longitudinal direction of the hull in order to counteract displacement of the center of lateral resistance of the hull when the hull heels.
Claim 2
Dependent Claim
99 words
A combined keel and rudder for a sail boat having a hull, including: a keel mounted on the hull for rotation of the keel about an axis extending in the longitudinal direction of the hull, a rudder mounted on the keel for rotation about said axis extending in the longitudinal direction of the hull, and means for swinging the keel and rudder in unison to selected positions on either side of said axis extending in the longitudinal direction of the hull in order to counteract displacement of the center of lateral resistance of the hull when the hull heels.
Claim 3
Dependent Claim
65 words
The combined keel and rudder of claim 1 in which the means for swinging the keel and rudder in unison to selected positions on either side of said axis extending in the longitudinal direction of the hull include a rudder post and driving means attached to the rudder post for moving the rudder post about said axis extending in the longitudinal direction of the hull.
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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |