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US3929549A Expired / Lapsed US ⏱️ 0.0 years remaining

Surfboard construction

Assignee: Individual
•
Filing: 1973-12-14
•
Granted: 1975-12-30
•
Expires: 1993-12-14
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Abstract

Abstract A surfboard which is constructed by molding two halves that each extend across the entire length of the board but across only half of the width, and joining the halves together with a thick layer of epoxy resin which also serves as a beam that strengthens the board against bending. Each half of the board has a fiberglass skin and a body of foam within the fiberglass skin, but the foam is cut away at the top and bottom of the inner surface so that the epoxy resin adheres to a large area of the fiberglass skin. The epoxy resin in the cut-away areas forms top and bottom flanges for the structural beam of epoxy resin.

Inventors

  • 👤 Robert L Smith

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 10:48
CPC Classifications
B; B63; B63B; B63B32/00; B63B32/50; B63B32/53; B63B32/40; B63B32/57

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 240 words
A METHOD FOR CONSTRUCTING A SURFBOARD COMPRISING: LAYEING COVER LAYERS IN EACH OF TWO MOLDS THAT EACH HAVE SUBSTANTIALLY THE SHAPE OF OPPOSITE HALVES OF A SURFBOARD THAT IS DIVIDED BY AB IMAGINARY VERTICAL PLANE PASSING LONGITUDINALLY THROUGH THE MIDDLE OF A HORIZONTAL SURFVIARDM ABD TGAT EACG GAVE A CAVUTT WUTG A DEOTG AT KEAST TWICE AS GREAT AS THE THICKNESS AT A MIDDLE PORTION THEREOF, INCLUDING APPLYING A THIN LAYER OF WAX-LIKE MATERIAL TO THE MOLD, SPRAYING A GEL COAT WITHIN THE WAX-LIKE MATERIAL, APPLYING FLEXIBLE FIBERGLASS SHEET MATERIAL SATURATED WITH RESIN WITHIN THE GEL COAT, AND SQUEEGEEING EXCESS RESIN FROM WITHIN THE FIERRGLASS SHEET MATERIAL; FILLING EACH MOLD WITH A MOLDABLE MATERIAL TO FORM TWO ELONGATED SURFBOARD PORTIONS, EACH WITH AN INNER SURFACE THAT CAN LIE SUBSTANTIALLY ALONG SAID IMAGINARY PLANE, INCLUDING POURING FOAMABLE MATERIAL INTO THE SHELL FORMED BY SAID COVER LAYER AND ALLOWING IT TO HARDEN, FORMING AN ELONGATED CUTOUT REGION IN THE MOLDING MATERIAL ALONG THE TOP AND BOTTOM OF EACH ELONGATED SURFBOARD PORTION AT THE INNER SURFACE THEREOF TO EXPOSE AN AREA OF THE INNER FACE OF THE COVER LAYER, FILLING THE CUTOUT REGIONS WITH AN EPOXY RESIN ADHESIVE AND ALLOWING IT TO HARDEN AT LEAST PARTIALLY, AND APPLYING A LAYER OF EPOXY RESIN ADHESIVE TO A PUTTY-LIKE CONSISTENCY AND OF A THICKNESS OF MORE THAN ONE-SIXTEENTH INCH TO THE INNER SURFACE OF THE BODY AND TO THE EPOXY ADHESIVE IN SAID CUTOUT REGIONS.
Claim 2
Independent Claim 240 words
A METHOD FOR CONSTRUCTING A SURFBOARD COMPRISING: LAYEING COVER LAYERS IN EACH OF TWO MOLDS THAT EACH HAVE SUBSTANTIALLY THE SHAPE OF OPPOSITE HALVES OF A SURFBOARD THAT IS DIVIDED BY AB IMAGINARY VERTICAL PLANE PASSING LONGITUDINALLY THROUGH THE MIDDLE OF A HORIZONTAL SURFVIARDM ABD TGAT EACG GAVE A CAVUTT WUTG A DEOTG AT KEAST TWICE AS GREAT AS THE THICKNESS AT A MIDDLE PORTION THEREOF, INCLUDING APPLYING A THIN LAYER OF WAX-LIKE MATERIAL TO THE MOLD, SPRAYING A GEL COAT WITHIN THE WAX-LIKE MATERIAL, APPLYING FLEXIBLE FIBERGLASS SHEET MATERIAL SATURATED WITH RESIN WITHIN THE GEL COAT, AND SQUEEGEEING EXCESS RESIN FROM WITHIN THE FIERRGLASS SHEET MATERIAL; FILLING EACH MOLD WITH A MOLDABLE MATERIAL TO FORM TWO ELONGATED SURFBOARD PORTIONS, EACH WITH AN INNER SURFACE THAT CAN LIE SUBSTANTIALLY ALONG SAID IMAGINARY PLANE, INCLUDING POURING FOAMABLE MATERIAL INTO THE SHELL FORMED BY SAID COVER LAYER AND ALLOWING IT TO HARDEN, FORMING AN ELONGATED CUTOUT REGION IN THE MOLDING MATERIAL ALONG THE TOP AND BOTTOM OF EACH ELONGATED SURFBOARD PORTION AT THE INNER SURFACE THEREOF TO EXPOSE AN AREA OF THE INNER FACE OF THE COVER LAYER, FILLING THE CUTOUT REGIONS WITH AN EPOXY RESIN ADHESIVE AND ALLOWING IT TO HARDEN AT LEAST PARTIALLY, AND APPLYING A LAYER OF EPOXY RESIN ADHESIVE TO A PUTTY-LIKE CONSISTENCY AND OF A THICKNESS OF MORE THAN ONE-SIXTEENTH INCH TO THE INNER SURFACE OF THE BODY AND TO THE EPOXY ADHESIVE IN SAID CUTOUT REGIONS.
Claim 3
Independent Claim 132 words
A method for constructing a surfboard comprising : laying cover layers in each of two molds that each have substantially the shape of opposite halves of a surfboard that is divided by an imaginary vertical plane passing longitudinally through the middle of a horizontal surfboard; filling each mold with a moldable material to form two elongated surfboard portions, each with an inner surface that can lie substantially along said imaginary plane; forming an elongated cutout region in the molding material along the top and bottom of each elongated surfboard portion at the inner surface thereof to expose an area of the inner face of the cover layer; and applying a layer of adhesive to the inner surfaces of the two surfboard portions to join them, including filling the cutout regions with adhesive.
Claim 4
Independent Claim 132 words
A method for constructing a surfboard comprising : laying cover layers in each of two molds that each have substantially the shape of opposite halves of a surfboard that is divided by an imaginary vertical plane passing longitudinally through the middle of a horizontal surfboard; filling each mold with a moldable material to form two elongated surfboard portions, each with an inner surface that can lie substantially along said imaginary plane; forming an elongated cutout region in the molding material along the top and bottom of each elongated surfboard portion at the inner surface thereof to expose an area of the inner face of the cover layer; and applying a layer of adhesive to the inner surfaces of the two surfboard portions to join them, including filling the cutout regions with adhesive.
Claim 5
Dependent Claim 32 words
The method described in claim 2 wherein: each of said molds has a shallow tail cavity; and including filling each tail cavity with said adhesive to form part of the surfboard tail.

References Cited (Backward Citations)

US3580799A Cited
US3543315A Cited
US3514798A Cited
US3615969A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-12-29 1979-06-30 1979-12-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-12-29 1983-06-30 1983-12-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-12-29 1987-06-30 1987-12-30 $7700.00 Window Closed / Lapsed

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