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. 21, 2009
Filed:
Sep. 02, 2005
Masaaki Ikeda, Kita-ku, JP;
Takaaki Kurata, Kita-ku, JP;
Syouichi Kaneko, Saitama, JP;
Junichi Segawa, Kita-ku, JP;
Masaaki Ikeda, Kita-ku, JP;
Takaaki Kurata, Kita-ku, JP;
Syouichi Kaneko, Saitama, JP;
Junichi Segawa, Kita-ku, JP;
Nippon Kayaku Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed is a near-infrared absorbing compound which does not contain antimony or arsenic, and has excellent stability, especially excellent heat resistance, light resistance and moist heat resistance. Also disclosed are a near-infrared absorbing filter, which is produced by using the near-infrared absorbing compound, and has excellent resistance such as light resistance and heat resistance, an optical filter and an optical recording medium. Specifically disclosed are a diimmonium compound represented by the formula (1) below and a near-infrared absorbing filter obtained by using such a diimmonium compound. Further specifically disclosed are a near-infrared absorbing filter wherein an adhesive layer containing the diimmonium compound is arranged on a transparent supporting body, and an optical filter using such a near-infrared absorbing filter. (In the formula (1), Rto Rindependently represent a hydrogen atom or an optionally substituted aliphatic hydrocarbon residue; Rto Rindependently represent an aliphatic hydrocarbon residue which may have a halogen atom; and rings A and B may further have a substituent).