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. 05, 2005
Filed:
Nov. 15, 2002
Applicants:
Shinobu Izumi, Yamaguchi-ken, JP;
Hironobu Nagoh, Yamaguchi-ken, JP;
Inventors:
Shinobu Izumi, Yamaguchi-ken, JP;
Hironobu Nagoh, Yamaguchi-ken, JP;
Assignee:
Tokuyama Corporation, Yamaguchi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D311/78 ; C07D311/94 ;
U.S. Cl.
CPC ...
Abstract
A chromene compound represented by the general formula (1), This compound exhibits excellent photochromic properties, such as small initial color, a large fading rate, excellent resistance and developing a color tone of a neutral tint.
Izumi, Shinobu. (2005). Chromene compound (U.S. Patent No. 6875878). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/6875878
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile