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. 05, 1988
Filed:
May. 30, 1986
Applicant:
Inventor:
Kiyoteru Kojima, Kobe, JP;
Assignee:
Sumitomo Chemical Company, Limited, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; C09K / ;
U.S. Cl.
CPC ...
350-11 ; 2522991 ; 260378 ; 260380 ;
Abstract
A near infrared ray absorption filter, particularly usable as a sharp cut filter for an infrared ray sensor, which comprises as an absorbent capable of controlling transmission of a ray at least one anthraquinone compound represented by the following formula, ##STR1## wherein A.sub.1, A.sub.2, A.sub.3 and A.sub.4 are different from each other or the same, and stand for a phenyl or naphthyl group unsubstituted or substituted with at least one alkyl, alkoxy, phenoxy or hydroxy group, and the rings A and B are unsubstituted or substituted with at least one lower alkyl group or halogen atom.