US3796175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catamaran
Assignee: Woodall Industries Inc
•
Filing: 1971-09-22
•
Granted: 1974-03-12
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Expires: 1991-09-22
Abstract
Abstract A catamaran is made with two hollow plastic hulls. Each hull consists of two vacuum formed plastic sheets heat sealed together at a vertical peripheral flange. The flange is enlarged on the lower side of the hull to define a keel. A load supporting framework is mounted on the hulls.
Inventors
- 👤 F Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:56
CPC Classifications
B; B63; B63B; B63B15/00; B63B15/02; B63B1/00; B63B1/02; B63B1/10; B63B1/12; B63B5/00; B63B5/24; B63B3/00; B63B3/02; B63B3/08; B63B2003/085
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
A multi-hulled sailboat including at least a pair of hollow water tight hulls each being made of two formed plastic sheets joined together at a peripheral flange extending around the hull and lying in a generally vertical plane, a load supporting platform mounted on and connecting said hulls, the flange of each of said hulls having a portion on the lower side thereof which is enlarged with respect to the remainder of said flange and which possesses a substantially greater vertical than transverse dimension to define a keel.
Claim 2
Dependent Claim
88 words
A multi-hulled sailboat including at least a pair of hollow water tight hulls each being made of two formed plastic sheets joined together at a peripheral flange extending around the hull and lying in a generally vertical plane, a load supporting platform mounted on and connecting said hulls, the flange of each of said hulls having a portion on the lower side thereof which is enlarged with respect to the remainder of said flange and which possesses a substantially greater vertical than transverse dimension to define a keel.
Claim 3
Dependent Claim
24 words
The structure set forth in claim 1 in which a hand hole is formed in said flange on the upper side of said hull.
Claim 4
Dependent Claim
44 words
The structure set forth in claim 1 in which a handle is formed in said flange on the upper side of said hull, said handle comprising an enlarged hollow portion and a hand hole opening formed in said flange beneath said enlarged hollow portion.
Claim 5
Dependent Claim
22 words
The structure set forth in claim 1 including a rudder bracket secured to said flange at the rear end of said hull.
Claim 6
Dependent Claim
23 words
The structure set forth in claim 1 in which said sheets are heat sealed together at marginal portions thereof to define said flange.
References Cited (Backward Citations)
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Cited
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Cited
US2926363A
Cited
US3008268A
Cited
US3191200A
Cited
US3147498A
Cited
US3566819A
Cited
US3585957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |