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:
Jul. 29, 1980
Filed:
Sep. 08, 1978
Applicant:
Inventors:
Richard J Hovey, Sturbridge, MA (US);
Nori Y Chu, Southbridge, MA (US);
Peter G Piusz, Longmeadow, MA (US);
Charles H Fuchsman, Bemidji, MN (US);
Assignee:
American Optical Corporation, Southbridge, MA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; C07D / ;
U.S. Cl.
CPC ...
252300 ; 350354 ; 544 71 ; 430345 ; 252600 ;
Abstract
Photochromic compounds of the formula ##STR1## wherein one of R.sub.1 and R.sub.2 is halogen or lower alkoxy, and the other is hydrogen, and R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen and their use in lenses are disclosed.