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:
Sep. 07, 1976
Filed:
Nov. 12, 1974
Applicant:
Inventors:
Wolfgang Schafer, Aachen, DT;
Helmer Raedisch, Aachen, DT;
Assignee:
Saint-Gobain Industries, Neuilly-sur-Seine, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428425 ; 428437 ; 260 / ; 260 / ; 427165 ;
Abstract
A scratch-resistant polyurethane coating for safety windows is made by curing a sheet of a liquid composition comprising (1) a polyglycol ether resulting from the condensation of propylene oxide with trimethylolpropane and containing 10.5%-12.0% free hydroxyls and (2) a biuret of 1,6-hexamethylene-diisocyanate, having 21-22% isocyanate groups, the weight ratio of said biuret to said polyglycol ether being about 0.9-1.1.