US4000712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boat hull construction
Assignee: Individual
•
Filing: 1975-09-23
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Granted: 1977-01-04
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Expires: 1995-09-23
Abstract
Abstract A boat comprising a main hull and an additional hull that is attached to the stern of the main hull. The additional hull is adjustable around a transversal axis relative to the main hull and acts as a trim plane. The bottom and sides of the main hull have extensions that overlap the forward part of the additional hull such that there is formed a flat, narrow and backwardly directed space between the extensions and the forward part of the additional hull. Air is sucked down under the additional hull through the space.
Inventors
- 👤 Ernst G. Erikson
- 👤 K. Hakan Lindstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:24
CPC Classifications
B; B63; B63B; B63B35/00; B63B35/66; B63B35/665; B63B1/00; B63B1/32; B63B1/34; B63B1/38; B63H; B63H21/00; B63H21/30; B63H21/305; Y; Y02; Y02T; Y02T70/00; Y02T70/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
In a boat with propulsion machinery and a boat hull construction comprising a main hull defined by bottom and side walls, an additional hull attached to the stern of the main hull, and means for adjusting the additional hull relative to the main hull, said additional hull having located therein the propulsion machinery, the main hull being provided with an extension member which is in overlapping relationship with the additional hull thereby to provide an air space between the two hulls and below an initial forward portion of the additional hull, the improvement comprising as said extension member, a member extending rearwardly from the main hull in the same plane as the bottom and side walls of the main hull so as to extend in a continuum in overlapping relationship with the additional hull, and as said means for adjusting the additional hull relative to the main hull, means for pivoting said additional hull about a fixed horizontal and transverse axis with respect to said main hull during operation of the boat.
Claim 2
Dependent Claim
172 words
In a boat with propulsion machinery and a boat hull construction comprising a main hull defined by bottom and side walls, an additional hull attached to the stern of the main hull, and means for adjusting the additional hull relative to the main hull, said additional hull having located therein the propulsion machinery, the main hull being provided with an extension member which is in overlapping relationship with the additional hull thereby to provide an air space between the two hulls and below an initial forward portion of the additional hull, the improvement comprising as said extension member, a member extending rearwardly from the main hull in the same plane as the bottom and side walls of the main hull so as to extend in a continuum in overlapping relationship with the additional hull, and as said means for adjusting the additional hull relative to the main hull, means for pivoting said additional hull about a fixed horizontal and transverse axis with respect to said main hull during operation of the boat.
Claim 3
Dependent Claim
57 words
The improvement of claim 1 wherein said additional hull is defined by bottom and side walls and said extension member is a continuous member which extends across the entire width of the bottom wall of said additional hull and upwardly along a substantial portion of the height of each of the side walls of the additional hull.
Claim 4
Dependent Claim
78 words
The improvement of claim 1 wherein said means for pivoting said additional hull about a fixed horizontal and transverse axis with respect to the main hull includes a fixed pivot point located in the air space between the two hulls and means for rotating said additional hull about said pivot point during operation of the boat, said means rotatably connecting the additional hull to the main hull and located at a vertically displaced distance from said pivot point.
Claim 5
Dependent Claim
26 words
The improvement of claim 3 wherein said means for rotating said additional hull about said pivot point during operation of the boat includes a hydraulic cylinder.
Claim 6
Dependent Claim
27 words
The improvement of claim 1 wherein said air space has an entrance and exit for the air and there is provided across said entrance a protective screen.
References Cited (Backward Citations)
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US3023431A
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US3018784A
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US3118411A
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US3164122A
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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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |