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. 14, 1992
Filed:
Jun. 29, 1989
Applicant:
Inventors:
Takashi Tanaka, Shinnanyo, JP;
Kenji Tanaka, Tokuyama, JP;
Satoshi Imura, Tokuyama, JP;
Yasuji Kida, Kudamatsu, JP;
Assignee:
Tokuyama Soda Kabushiki Kaisha, Yamaguchi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G03C / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
252586 ; 252589 ; 548407 ; 549234 ; 549236 ; 549239 ; 549 41 ; 549 44 ; 549 45 ; 549 47 ; 549 48 ; 549 42 ; 430336 ; 430339 ;
Abstract
A photochromic compound represented by the following general formula [I] ##STR1## wherein ##STR2## represents a divalent aromatic hydrocarbon group or a divalent heterocyclic group each of which may have a substituent,