Patent US1453918A successfully refreshed from Google Patents.
US3965514A
Expired / Lapsed
US
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Adjustable and/or removable fin for surfboards
Assignee: Individual
•
Filing: 1975-01-30
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Granted: 1976-06-29
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Expires: 1995-01-30
Abstract
Abstract A removable fin unit for a surfboard including a fin having integral fillets on opposite sides thereof together with thread members for removably joining such fillets to the surfboard.
Inventors
- 👤 Arthur B. Shafer
- 👤 James E. Richardson
- 👤 Jay L. Shuirman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:43
CPC Classifications
B; B63; B63B; B63B32/00; B63B32/60; B63B32/66
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A removable fin unit for a surfboard which comprises a fin having integral fillets at opposite sides of its base and arranged to abut the bottom of the surfboard, and means for removably joining said fillets to said surfboard, said joining means including a fin holder having the conformation of an open-ended rectangular trough, the sides of which are adapted for insertion into the bottom of surfboard and connection thereto in a position such that the bottom of the trough is substantially flush with the bottom of the surfboard.
Claim 2
Dependent Claim
89 words
A removable fin unit for a surfboard which comprises a fin having integral fillets at opposite sides of its base and arranged to abut the bottom of the surfboard, and means for removably joining said fillets to said surfboard, said joining means including a fin holder having the conformation of an open-ended rectangular trough, the sides of which are adapted for insertion into the bottom of surfboard and connection thereto in a position such that the bottom of the trough is substantially flush with the bottom of the surfboard.
Claim 3
Dependent Claim
28 words
A removable fin unit according to claim 1 wherein the sides of said fin holder are spaced a distance to accommodate the central stringer of a surfboard therebetween.
Claim 4
Dependent Claim
18 words
A removable fin unit according to claim 1 wherein the sides of said fin holder include longitudinal grooves.
Claim 5
Dependent Claim
62 words
A removable fin unit according to claim 1 wherein said joining means includes a plurality of threaded holes extending into the sides of said trough from its bottom surface, and holes through said fin fillets arranged for registry with selected threaded holes in said trough sides and bolts passing through said fin holes into the selected threaded holes in said trough sides.
Claim 6
Dependent Claim
41 words
A removable fin unit according to claim 1 wherein the sides of said rectangular trough each include longitudinal channels which are centrally widened to slidably support straps having holes therein which are adapted to receive bolts passing through said fin holes.
References Cited (Backward Citations)
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Cited
US3096530A
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US3395411A
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US3516099A
Cited
US3564632A
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US3579681A
Cited
US3659300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |