US3600733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planing boat hull
Assignee: Rubbermaid Inc
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Filing: 1970-03-18
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Granted: 1971-08-24
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Expires: 1990-03-18
Abstract
Abstract A planing type boat hull for maintaining a substantially constant trim angle throughout a slow to moderate speed range, said hull having a flat-bottomed central longitudinal tunnel with its sidewalls tapering outwardly from bow to stern to gradually increase the tunnel width, and a central lifting surface extending longitudinally throughout said tunnel, said lifting surface being inclined to the tunnel bottom to form a channel extending forwardly of the medial portion thereof and forming an inclined plane projecting downwardly from the tunnel bottom and extending rearwardly of the medial portion.
Inventors
- 👤 Hangwind F Lippisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:33
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/16; B63B1/18; B63B1/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
72 words
A planing boat hull for maintaining optimum trim angle throughout a slow to moderate speed range, said hull having a central longitudinal tunnel of gradually increasing width from bow to stern, and a central inclined lifting surface extending longitudinally of said tunnel, said lifting surface forming an inclined projection terminating flush with the bottom of said tunnel at the longitudinally medial portion of the hull and inclining downwardly therefrom to the stern.
Claim 2
Dependent Claim
72 words
A planing boat hull for maintaining optimum trim angle throughout a slow to moderate speed range, said hull having a central longitudinal tunnel of gradually increasing width from bow to stern, and a central inclined lifting surface extending longitudinally of said tunnel, said lifting surface forming an inclined projection terminating flush with the bottom of said tunnel at the longitudinally medial portion of the hull and inclining downwardly therefrom to the stern.
Claim 3
Dependent Claim
29 words
A planing boat hull as in claim 1, in which each sidewall of the tunnel tapers on an angle of about 2* -6* with respect to the center line.
Claim 4
Dependent Claim
43 words
A planing boat hull as in claim 2, in which the lifting surface gradually increases in width toward the stern, and each sidewall of the inclined projection tapers on an angle of the order of 1* -3* with respect to the center line.
Claim 5
Dependent Claim
21 words
A planing boat hull as in claim 3 in which each sidewall of the inclined projection is laterally inclined upwardly outward.
Claim 6
Dependent Claim
18 words
A planing boat hull as in claim 2, in which each tunnel sidewall is laterally inclined upwardly inward.
Claim 7
Dependent Claim
20 words
A planing boat hull as in claim 1, in which the lifting surface gradually increases in width toward the stern.
Claim 8
Dependent Claim
38 words
A planing boat hull as in claim 1, in which the central inclined lifting surface extends forwardly at the same inclination to the bow forming a channel recess in the bottom of the tunnel of gradually increasing depth.
Claim 9
Dependent Claim
21 words
A planing boat hull as in claim 7, in which the lifting surface gradually increases in width from bow to stern.
Claim 10
Dependent Claim
46 words
A planing boat hull as in claim 8, in which each sidewall of the tunnel tapers on an angle of about 2* -6* and each side wall of the lifting surface tapers on an angle of the order of 1* -3* with respect to the centerline.
Claim 11
Dependent Claim
34 words
A planing boat hull as in claim 9, in which the area of the bottom surface of the tunnel is from about 43 percent to 100 percent times the area of the lifting surface.
Claim 12
Dependent Claim
37 words
A planing boat hull as in claim 10, in which each tunnel sidewall and each sidewall of the channel recess is laterally inclined upwardly inward and each sidewall of the inclined projection is laterally inclined upwardly outward.
Claim 13
Dependent Claim
34 words
A planing boat hull as in claim 7, in which the area of the bottom surface of the tunnel is from about 43 percent to 100 percent times thE area of the lifting surface.
Claim 14
Dependent Claim
38 words
A planing boat hull as in claim 7, in which each tunnel sidewall and each sidewall of the channel recess is laterally inclined upwardly inward and each side wall of the inclined projection is laterally inclined upwardly outward.
Claim 15
Dependent Claim
38 words
A planing boat hull as in claim 9, in which each tunnel sidewall and each sidewall of the channel recess is laterally inclined upwardly inward and each side wall of the inclined projection is laterally inclined upwardly outward.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |