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. 20, 2004
Filed:
Oct. 15, 2001
Applicant:
Inventors:
Yuichiro Kawabata, Tokuyama, JP;
Yasuko Takeda, Tokuyama, JP;
Junji Momoda, Tokuyama, JP;
Hironobu Nagoh, Tokuyama, JP;
Shinobu Izumi, Tokuyama, JP;
Assignee:
Tokuyama Corporation, Yamaguchi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
C07D / ;
Abstract
Novel chromene compounds having various substituents to exhibit a high color-developing sensitivity and a high density even when dispersed in a high-molecular matrix, and exhibiting a large fading rate, less color when deteriorated, and excellent light resistance in the photochromic properties; photochromic materials containing the chromene compounds; and use thereof.