The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 1995
Filed:
Aug. 16, 1993
Timothy A Niemier, Bellingham, WA (US);
Other;
Abstract
A method of fabricating a sit-on-top kayak having a recessed cockpit surface and an integrally formed hatch flange surrounding a hatch opening. The hatch flange is substantially parallel to the cockpit surface. Such a kayak is formed with a mold having a void formed therein, the void having a recess portion for forming the flange. The recess portion of the void provides negative draft to the mold. Space is provided in the mold such that, during rotational molding, a mass of molten polyethylene accumulates adjacent to the recess containing the polyethylene that will form the flange. When the polyethylene cools and shrinks, the shrinkage of the mass of polyethylene pulls the flange at least partly out of its recess, allowing the kayak blank to be withdrawn from the mold.