US4561371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catamaran stabilization structure
Assignee: Individual
•
Filing: 1984-07-16
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Granted: 1985-12-31
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Expires: 2004-07-16
Abstract
Abstract A catamaran stabilization structure for catamaran sailboats which includes a centerboard and dagger-boards. The centerboard has a double wing stabilizer with adjustable pitch. The dagger-boards protrude through each of the hulls. Each dagger-board has a single wing stabilizer.
Inventors
- 👤 Richard L. Kelley
- 👤 Frederick W. Holbrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:47
CPC Classifications
B; B63; B63B; B63B3/00; B63B3/14; B63B3/38; B63B1/00; B63B1/02; B63B1/10; B63B1/12; B63B1/121; B63B41/00; B63H; B63H9/00; B63H9/04; B63B2001/123; B63B35/00; B63B2035/009
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
167 words
In a catamaran sailboat with a bow and stern that includes a pair of laterally spaced parallel hulls and interconnecting bracing and decking secured to said hulls, a catamaran stabilization structure comprising: a longitudinal opening in the decking intermediately disposed between the hulls having a forward end and an aft end corresponding to the bow and stern respectively; a centerboard, protruding through said longitudinal opening, having a deck end which terminates in a handle and is positioned above the decking, and a water end which terminates in a double wing stabilizer approximately perpendicular to the centerboard and positioned beneath the water surface which stabilizer wings are slightly swept back from the bow in the direction of the stern and are rippled from bow to stern; a pair of dagger-boards each of which protrudes through a hull; and a plurality of various sized wedges for adjusting the pitch of the centerboard stabilizer which are inserted forward and aft of the centerboard deck end within the centerboard deck opening.
Claim 2
Dependent Claim
167 words
In a catamaran sailboat with a bow and stern that includes a pair of laterally spaced parallel hulls and interconnecting bracing and decking secured to said hulls, a catamaran stabilization structure comprising: a longitudinal opening in the decking intermediately disposed between the hulls having a forward end and an aft end corresponding to the bow and stern respectively; a centerboard, protruding through said longitudinal opening, having a deck end which terminates in a handle and is positioned above the decking, and a water end which terminates in a double wing stabilizer approximately perpendicular to the centerboard and positioned beneath the water surface which stabilizer wings are slightly swept back from the bow in the direction of the stern and are rippled from bow to stern; a pair of dagger-boards each of which protrudes through a hull; and a plurality of various sized wedges for adjusting the pitch of the centerboard stabilizer which are inserted forward and aft of the centerboard deck end within the centerboard deck opening.
Claim 3
Dependent Claim
56 words
A catamaran stabilization structure in accordance with claim 1 wherein: each dagger-board has a deck end which is positioned above the hull, and a water end which terminates in a single wing stabilizer approximately perpendicular to the dagger-board on the side of the dagger-board away from the other dagger-board and is positioned beneath the water surface.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |