US4760810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hull for small watercraft
Assignee: Yamaha Motor Co Ltd
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Filing: 1986-11-21
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Granted: 1988-08-02
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Expires: 2006-11-21
Abstract
Abstract A hull configuration for a watercraft that improves stability in straight ahead running without significantly increasing the resistance to forward movement. The hull is comprised of a generally flat center section that is surrounded on each longitudinal side by a pair of arcuate sections, the outer peripheries of which are defined by respective chines.
Inventors
- 👤 Noboru Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:43
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/16; B63B1/18; B63B34/00; B63B34/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
191 words
A watercraft hull for increasing stability and handling comprising a generally flat undersurface extending for a portion of the width of said hull on both sides of its longitudinal center line, a first pair of curved sections each formed transversely outwardly of the respective side of said flat undersurface and having a concave configuration for generating a reduced pressure area on opposite sides of said flat undersurface for reducing frictional losses and increasing stability, the outer periphery of said first pair of curved sections in transverse cross sections of said hull being defined by a raised chine, a second pair of curved sections formed transversely outwardly of the first pair of chines and having a concave configuration, the outer periphery of said second pair of curved sections in transverse cross sections of said hull being defined by a second pair of chines, and a third pair of curved sections curving convexly from said second pair of chines and extending transversely outwardly of second pair of chines, the outer periphery of said third pair of curved sections being defined by a third pair of chines in transverse cross sections of said hull.
Claim 2
Dependent Claim
191 words
A watercraft hull for increasing stability and handling comprising a generally flat undersurface extending for a portion of the width of said hull on both sides of its longitudinal center line, a first pair of curved sections each formed transversely outwardly of the respective side of said flat undersurface and having a concave configuration for generating a reduced pressure area on opposite sides of said flat undersurface for reducing frictional losses and increasing stability, the outer periphery of said first pair of curved sections in transverse cross sections of said hull being defined by a raised chine, a second pair of curved sections formed transversely outwardly of the first pair of chines and having a concave configuration, the outer periphery of said second pair of curved sections in transverse cross sections of said hull being defined by a second pair of chines, and a third pair of curved sections curving convexly from said second pair of chines and extending transversely outwardly of second pair of chines, the outer periphery of said third pair of curved sections being defined by a third pair of chines in transverse cross sections of said hull.
Claim 3
Dependent Claim
43 words
A watercraft hull as set forth in claim 1 wherein the chines extend generally parallel to the longitudinal center line from the rear of the watercraft hull to forwardly of its center of gravity and thereafter curve inwardly toward the longitudinal center line.
Claim 4
Dependent Claim
28 words
A watercraft hull as set forth in claim 1 wherein the third pair of chines is formed upwardly and outwardly of the first, second and third curved sections.
Claim 5
Dependent Claim
24 words
A watercraft hull as set forth in claim 3 wherein the flat undersurface comprises no more than one-third of the width of the hull.
Claim 6
Dependent Claim
23 words
A watercraft full as set forth in claim 4 wherein the third pair of chines are defined by generally horizontally downwardly facing surfaces.
Claim 7
Dependent Claim
52 words
A watercraft hull as set forth in claim 1 wherein the third pair of chines comprising generally horizontally extending undersurfaces formed at the outer peripheral edges of the third curved sections for engaging the water upon leaning of the watercraft for assisting its stability and for limiting the amount of leaning permitted.
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) | 1991-08-02 | 1992-02-01 | 1992-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-02 | 1996-02-01 | 1996-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-02 | 2000-02-01 | 2000-08-02 | $7700.00 | Window Closed / Lapsed |