Patent US3964422A successfully refreshed from Google Patents.
US3964422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marine fender
Assignee: Individual
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Filing: 1975-09-18
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Granted: 1976-06-22
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Expires: 1995-09-18
Abstract
Abstract A fender for boats or the like is disclosed herein having an inner core filled with a resilient foam material of a given density or compressibility and an outer shell having its wall coextensive with the inner core so as to define an outer chamber occupied with a second resilient foam material of a lesser density or compressibility than the material captured within the inner core. The inner core and outer shell are integrally formed to provide a single unitary construction and end swivels are carried on the opposite ends of the fender for evenly distributing of applied loads.
Inventors
- 👤 Harold B. Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:36
CPC Classifications
E; E02; E02B; E02B3/00; E02B3/20; E02B3/26; Y; Y02; Y02A; Y02A30/00; Y02A30/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
168 words
A marine fender comprising the combination of: an inner core having open-opposite ends leading into a first chamber defined by the inner wall surface of said core; each of said open opposite ends of said core provided with an integral outwardly flared portion terminating in a circular edge; an outer shell coaxially disposed with respect to said inner core having circular opposite ends joined to said flared portions circular edges respectively so as to provide an integral joint therewith; said outer shell and said inner core defining a second chamber coaxially disposed with said first chamber and defined between the opposing wall surfaces of said inner core and said outer shell respectively; a first plastic foam filler material of a given density occupying said first chamber and a second plastic foam filler material of a density less than said given density of said first foam filler material occupying said second chamber; and swivel means carried on a rope passing through said core at opposite ends of said fender.
Claim 2
Dependent Claim
168 words
A marine fender comprising the combination of: an inner core having open-opposite ends leading into a first chamber defined by the inner wall surface of said core; each of said open opposite ends of said core provided with an integral outwardly flared portion terminating in a circular edge; an outer shell coaxially disposed with respect to said inner core having circular opposite ends joined to said flared portions circular edges respectively so as to provide an integral joint therewith; said outer shell and said inner core defining a second chamber coaxially disposed with said first chamber and defined between the opposing wall surfaces of said inner core and said outer shell respectively; a first plastic foam filler material of a given density occupying said first chamber and a second plastic foam filler material of a density less than said given density of said first foam filler material occupying said second chamber; and swivel means carried on a rope passing through said core at opposite ends of said fender.
Claim 3
Dependent Claim
29 words
The invention as defined in claim 1 including a frusto-conically shaped liner carried at each end of inner core and disposed between said swivel means and said flared portion.
Claim 4
Dependent Claim
29 words
The invention as defined in claim 2 wherein said swivel means includes a ball shaped element comprising a pair of clamp pieces joined together by bolt and nut sets.
Claim 5
Dependent Claim
30 words
The invention as defined in claim 3 wherein said core includes an integrally formed neck interconnecting said core with said flared portion at the respective opposite ends of said fender.
Claim 6
Dependent Claim
18 words
The invention as defined in claim 4 wherein said foam filler material is a closed cell plastic composition.
Claim 7
Dependent Claim
33 words
The invention as defined in claim 5 wherein said first and second foam filler materials provide a two stage shock absorbing structure wherein said second filler material compresses before said first filler material.
Claim 8
Dependent Claim
21 words
The invention as defined in claim 6 wherein said swivel means translate applied impact loads to said fender into said rope.
Claim 9
Dependent Claim
36 words
The invention as defined in claim 7 wherein said outer shell includes a plurality of ribs integrally formed on the exterior surface thereof so as to outwardly project to provide a radial pattern in end view.
Claim 10
Dependent Claim
23 words
The invention as defined in claim 8 wherein said core, said shell and said filler materials are bonded into a single unitary construction.
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) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |