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. 05, 1990
Filed:
Dec. 30, 1988
Applicant:
Inventor:
Harry G Heller, Cardiff, GB;
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
252586 ; 252589 ; 549381 ; 549390 ; 549389 ; 549408 ; 549406 ; 351163 ; 350354 ;
Abstract
Described are a series of novel photochromic benzopyran and naphthopyran compounds in which two cyclopropyl groups are appended at the 2-position of the benzopyran or naphthopyran ring. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic or plano lenses that incorporate the noval pyran compounds or combinations of the novel pyran compounds with other complementary photochromic compounds are described. ##STR1##