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. 15, 2014
Filed:
Mar. 07, 2012
Junji Takenaka, Shunan, JP;
Junji Momoda, Shunan, JP;
Kazuhiro Teranishi, Shunan, JP;
Toshiaki Takahashi, Shunan, JP;
Mitsuyoshi Sando, Shunan, JP;
Shinobu Izumi, Shunan, JP;
Junji Takenaka, Shunan, JP;
Junji Momoda, Shunan, JP;
Kazuhiro Teranishi, Shunan, JP;
Toshiaki Takahashi, Shunan, JP;
Mitsuyoshi Sando, Shunan, JP;
Shinobu Izumi, Shunan, JP;
Tokuyama Corporation, Shunan-Shi, JP;
Abstract
A novel photochromic compound which develops a color of a neutral tint and has high color optical density, high fading speed and excellent durability. The present invention is a chromene compound having an indeno(2,1-f)naphtho(1,2-b)pyran structure as the basic skeleton in which a hetero ring having two hetero atoms including at least one sulfur atom is directly bonded to the 6-position and the 7-position of the indeno(2,1-f)naphtho(1,2-b)pyran structure via the hetero atom like the compound represented by the following formula (18).