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. 11, 2006
Filed:
Sep. 06, 2000
Naoki Hayashi, Iwaki, JP;
Hiroki Katono, Iwaki, JP;
Masuhiro Syouji, Iwaki, JP;
Tomoyoshi Koizumi, Iwaki, JP;
Katsuichi Machida, Iwaki, JP;
Naoki Hayashi, Iwaki, JP;
Hiroki Katono, Iwaki, JP;
Masuhiro Syouji, Iwaki, JP;
Tomoyoshi Koizumi, Iwaki, JP;
Katsuichi Machida, Iwaki, JP;
Kureha Corporation, Tokyo, JP;
Abstract
The optical filter of the present invention is provided with a near infrared light absorption layer that contains a component composed of copper ions and a phosphoric ester compound expressed by the following Formula (10), in which the phosphorus atom content in the near infrared light absorption layer is 0.4 to 1.3 mol per mole of copper ions, and the copper ion content in the near infrared light absorption layer is 2 to 60 wt %. Thus keeping the phosphorus atom and copper ion content within specific ranges results in good near infrared light absorption and in improved moisture resistance whereby devitrification caused by whitening is suppressed