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US 4,325,154 AGranted
Surfboard fin
OwnerWilliam E. Collum, Jr.inventor
Life of this patent
Estimating the term…
Abstract
A surfboard fin is disclosed which is formed of shaped plastic opposed members which are joined and sealed to form a hollow light-weight buoyant construction, which provides an external contour to reduce drag in surfboarding. The novel profiled plastic surfboard fin is readily mounted to conventional boards and replaces the present conventional fiberglass fins.
Claims11
A surfboard fin consisting of a body formed of molded plastic being formed as a hollow cavity so as to be buoyant, and means connected to the body to join said body to a surfboard;
- said plastic extending outwardly from said means so as to provide an outwardly extending external contour and fin profile so as to reduce drag on said fin while imparting buoyancy to the surfboard, said outwardly extending plastic being formed with a pair of facingly disposed shoulders disposed on opposite sides of said means, and opposed side members curving downwardly from said shoulders to form said external contour and fin profile.
Dependencies are inferred from the claim text.