Patent US3807337A successfully refreshed from Google Patents.
US3807337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boat hulls
Assignee: Individual
•
Filing: 1971-04-19
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Granted: 1974-04-30
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Expires: 1991-04-19
Abstract
Abstract A boat hull, part of which (preferably the forward section) is shaped as a twin keel, and part of which (preferably the rearward section) is shaped as a single keel.
Inventors
- 👤 K English
- 👤 J Filmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:02
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/02; B63B1/04; B63B1/042
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
90 words
A boat hull comprising a one-piece structure having a substantially rectangular shape, and formed with two keels at the forward section of the hull extending rearwardly to approximately halfway only along the hull, a single keel at the rearward section of the hull extending forwardly to approximately halfway along the hull, said single keel extending longitudinally centrally of the hull and extending laterally of the hull over substantially the whole width of the hull rearwardly of the said two keels, and all three keels having a substantially V shaped cross-section.
Claim 2
Dependent Claim
90 words
A boat hull comprising a one-piece structure having a substantially rectangular shape, and formed with two keels at the forward section of the hull extending rearwardly to approximately halfway only along the hull, a single keel at the rearward section of the hull extending forwardly to approximately halfway along the hull, said single keel extending longitudinally centrally of the hull and extending laterally of the hull over substantially the whole width of the hull rearwardly of the said two keels, and all three keels having a substantially V shaped cross-section.
Claim 3
Dependent Claim
120 words
A boat hull comprising a one-piece structure having a substantially rectangular shape, and formed with two keels at the forward section of the hull extending rearwardly to approximately halfway along the hull, a single keel at the rearward section of the hull extending forwardly to approximately halfway along the hull, said single keel extending centrally of the hull, and all three keels having a substantially V shaped cross-section, said boat hull also having two inclined side portions, with the two keels at the forward end each have one arm of their substantially V shaped cross-section planar with one of said inclined side portions and being inclined to the vertical at a sharper angle than the other arm of the V.
Claim 4
Dependent Claim
120 words
A boat hull comprising a one-piece structure having a substantially rectangular shape, and formed with two keels at the forward section of the hull extending rearwardly to approximately halfway along the hull, a single keel at the rearward section of the hull extending forwardly to approximately halfway along the hull, said single keel extending centrally of the hull, and all three keels having a substantially V shaped cross-section, said boat hull also having two inclined side portions, with the two keels at the forward end each have one arm of their substantially V shaped cross-section planar with one of said inclined side portions and being inclined to the vertical at a sharper angle than the other arm of the V.
Claim 5
Dependent Claim
27 words
A boat hull as defined in claim 2, in which the single keel has both arms of its V shaped cross-section extending upwardly to said side portions.
Claim 6
Dependent Claim
31 words
A boat hull as defined in claim 3, in which each of the three keels extend rearward and downward to provide a lowest point on each keel at its rearmost location.
Claim 7
Dependent Claim
121 words
A boat hull comprising a one-piece structure having a substantially rectangular shape with two inclined side portions, and formed with two forward keels at the forward section of the hull extending rearwardly and progressively downwardly to approximately halfway along the hull, and a single keel at the rearward section of the hull extending forwardly and progressively upwardly to approximately halfway along the hull, said two forward keels each having a substantially ''''V'''' shaped cross-section with one arm substantially planar with one of said inclined side portions and being inclined to the vertical at a sharper angle than the other arm, and said single keel having a ''''V'''' shaped cross-section with both arms of the ''''V'''' extending upwardly to said side portions.
Claim 8
Dependent Claim
121 words
A boat hull comprising a one-piece structure having a substantially rectangular shape with two inclined side portions, and formed with two forward keels at the forward section of the hull extending rearwardly and progressively downwardly to approximately halfway along the hull, and a single keel at the rearward section of the hull extending forwardly and progressively upwardly to approximately halfway along the hull, said two forward keels each having a substantially ''''V'''' shaped cross-section with one arm substantially planar with one of said inclined side portions and being inclined to the vertical at a sharper angle than the other arm, and said single keel having a ''''V'''' shaped cross-section with both arms of the ''''V'''' extending upwardly to said side portions.
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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |