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. 19, 1991
Filed:
Feb. 24, 1989
Applicant:
Inventor:
Nori Y Chu, Shrewsbury, MA (US);
Assignee:
American Optical Corporation, Southbridge, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F21V / ; F21V / ;
U.S. Cl.
CPC ...
252587 ; 544 71 ; 350354 ;
Abstract
Spirooxazine compounds are incorporated into a plastic host comprised of copolymers of poly(vinyl alcohol) and poly(vinyl acetate). This combination results in a photochromic composite which exhibits significantly improved temperature stability relative to the prior art.