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:
Oct. 13, 1992
Filed:
Feb. 20, 1990
Applicant:
Inventors:
Junichi Hibino, Hirakata, JP;
Eiji Ando, Katano, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; G03C / ;
U.S. Cl.
CPC ...
548409 ;
Abstract
The present invention provides a photochromic material possessing absorption sensitivity in a longer wavelength region when compared with conventional photochromic materials. The photochromic material is a spiropyran compound having a methoxy group at the 6 position, nitro groups at the 8 and 5' positions, and an alkyl group at the 1' position of the spiropyran skeleton as shown below: ##STR1##