Patent US4307457A successfully refreshed from Google Patents.
US4307457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slamming-resistant sonar dome canoe
Assignee: FLEET IND
•
Filing: 1980-02-05
•
Granted: 1981-12-22
•
Expires: 2000-02-05
Abstract
Abstract A slamming-resistant sonar dome canoe is provided herein. The canoe generally consists of a shell, e.g., of fiberglass-reinforced plastic e.g., polyester resin with an extensive internal reinforcement of plastic foam, e.g., epoxy foam in the bottom of the canoe, buttressed by an additional but simple lightweight metal framework e.g., steel or aluminum at the mounting flanges and in the upper portion of the canoe interior and preferably bonded thereto by the thermosetting polyester resin. This sonar dome canoe achieves the conflicting requirements for light weight and robustness in a canoe used in a slamming environment.
Inventors
- 👤 Ronald B. Wills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:52
CPC Classifications
B; B63; B63B; B63B49/00; G; G10; G10K; G10K11/00; G10K11/004; G10K11/006
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
A canoe for sonar domes comprising: a lightweight, strong, formed shell; an internal form-fitting reinforcement of plastic foam in the bottom thereof; and a light-weight, metal, reinforcing framework in the upper portion thereof, secured thereto along the peripheral edges of the canoe.
Claim 2
Dependent Claim
42 words
A canoe for sonar domes comprising: a lightweight, strong, formed shell; an internal form-fitting reinforcement of plastic foam in the bottom thereof; and a light-weight, metal, reinforcing framework in the upper portion thereof, secured thereto along the peripheral edges of the canoe.
Claim 3
Dependent Claim
15 words
The canoe of claim 1 wherein said shell is formed of fiberglass-reinforced thermosetting plastics material.
Claim 4
Dependent Claim
14 words
The canoe of claim 2 wherein said thermosetting plastics material is a polyester resin.
Claim 5
Dependent Claim
17 words
The canoe of claim 2 wherein said shell includes a stiffener web along the inside keel line.
Claim 6
Dependent Claim
22 words
The canoe of claim 4 wherein said stiffener web is formed of steel, and is substantially completely enclosed by said fiberglass-reinforced plastic.
Claim 7
Dependent Claim
23 words
The canoe of claim 4 wherein said stiffener web is formed of aluminum, and is substantially completely enclosed by said fiberglass reinforced plastic.
Claim 8
Dependent Claim
20 words
The canoe of claim 2 wherein the upper rim of the canoe is provided with an inwardly directed peripheral lip.
Claim 9
Dependent Claim
20 words
The canoe of claim 7 wherein said framework is bonded to said peripheral lip by means of said thermosetting material.
Claim 10
Dependent Claim
20 words
The canoe of claim 7 wherein said framework is provided with inwardly directed, peripheral mounting flanges at said upper rim.
Claim 11
Dependent Claim
73 words
The canoe of claim 9 wherein said framework comprises a peripheral contour of said upper rim; a plurality of spaced-apart, downwardly depending gussets rigidly secured thereto; a plurality of transverse bars each connected, at one end, to an associated one of said gussets; a central longitudinal channel bar having the other end of said transverse bars integrally secured thereto; and a pair of upwardly extending gussets at each end of said channel bar.
Claim 12
Dependent Claim
26 words
The canoe of claim 9 wherein said framework is secured to said canoe only by means of securement of said peripheral flange to said upper rim.
Claim 13
Dependent Claim
13 words
The canoe of claim 1 wherein said plastic foam in foamed in situ.
Claim 14
Dependent Claim
18 words
The canoe of claim 10 wherein said plastic foam is foamed in situ and encases said channel bar.
References Cited (Backward Citations)
US2417830A
Cited
US2672945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |