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:
Oct. 05, 1982
Filed:
Feb. 02, 1981
Kent A Weisner, Altamonte Springs, FL (US);
Lester L Walls, Jr, Winter Park, FL (US);
Kenergy Corporation, Orlando, FL (US);
Abstract
A method for molding a polycarbonate plastic sheet into a skylight dome or the like. A clamp frame is preheated to a first temperature. A polycarbonate plastic sheet is thereafter clamped around its perimeter in the preheated clamp frame and preheated to approximately the first temperature. The unclamped portion of the plastic sheet is heated to about 300.degree. by ovens to soften the plastic for forming. The softened plastic sheet is then subjected to forming by a pair of coacting peripheral heated molds to form steps and pushes in the plastic sheet immediately adjacent to the clamp frames. A vacuum is drawn over the center portion of the sheet to free-form a dome. The molds are separated and the formed article is removed from the heated clamp frame. The steps of preheating the plastic sheet perimeter in the heated clamp frame and heating of the peripheral molds prevents distortion of the flange area of the slylight dome and of the step and push areas of the dome.