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:
Jan. 13, 1987
Filed:
Dec. 05, 1985
Applicant:
Inventor:
Masahiro Hosoda, Kyoto, JP;
Assignee:
Unitika Ltd., Kyoto, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
544 71 ; 350354 ;
Abstract
A photochromic compound represented by formula (I): ##STR1## wherein one of X.sub.1 and X.sub.2 represents a hydroxyl group, a sulfonic acid group or an alkali metal sulfonate base, and the other of X.sub.1 and X.sub.2 represents a hydrogen atom; X.sub.3 and X.sub.4 each represents a hydrogen atom, a lower alkyl group having from 1 to 3 carbon atoms, a lower alkoxy group having from 1 to 3 carbon atoms, a halogen atom, a nitro group or a cyano group; and R represents a straight chain alkyl group having from 1 to 30 carbon atoms. The compound exhibits excellent color developability.