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:
Nov. 30, 1982
Filed:
Oct. 21, 1981
Applicant:
Inventor:
Robert B Rau, Canyon Country, CA (US);
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ; B29C / ;
U.S. Cl.
CPC ...
264 25 ; 264-27 ; 264162 ; 264235 ; 264291 ; 264292 ; 264293 ; 264322 ; 264346 ;
Abstract
A stretched acrylic sheet which is to be formed into a vision panel at an elevated temperature has its major surfaces reheated to an elevated temperature to intentionally generate a class of surface formations thereon for subsequent removal by polishing prior to the formation of the final vision panel. Such surface deformations are otherwise undesirably generated during vision panel formation and detract from the optical quality of the final product.