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:
Apr. 04, 1995
Filed:
Apr. 20, 1994
Applicant:
Inventor:
Akira Miyashita, Ageo, JP;
Assignee:
Otsuka Kagaku Kabushiki Kaisha, Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430345 ; 430495 ; 430962 ; 430964 ; 252586 ; 3461351 ;
Abstract
The object of the invention is to provide a novel compound suited for use as a thermochromic and photochromic material. The invention relates to an indolinospirobenzopyran derivative of the general formula ##STR1## [wherein R.sup.1 stands for C.sub.1-20 alkyl, aralkyl, methacryloxymethyl or methacryloxyethyl; R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 may for example be hydrogen; R.sup.8 may for example be hydrogen or methacryloxymethyl; Y may for example be oxygen or sulfur] and a process for producing the derivative.