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:
Jun. 26, 1990
Filed:
May. 17, 1988
Applicant:
Inventor:
Patricia L Kwiatkowski, Akron, OH (US);
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
252586 ; 252582 ; 544 70 ; 544 71 ;
Abstract
Described are novel spiro(benzindolino) benzoxazine compounds and compositions containing such compounds. Photochromic sprio(benzindolino) benzoxazines may be incorporated into plastic host materials to produce photochromic articles.