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:
Mar. 18, 1997
Filed:
Aug. 28, 1995
Masuhiro Shouji, Iwaki, JP;
Takeo Ogihara, Iwaki, JP;
Hiroki Katono, Iwaki, JP;
Teruo Sakagami, Iwaki, JP;
Kureha Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed herein is a plastic optical filter which has a combined optical function that it has an effect of effectively blocking or attenuating rays in the wavelength range of a near infrared region and excellent luminosity factor-compensating ability and is provided with an optical low-pass filtering function, and is low in specific gravity and hygroscopicity, free from devitrification with time and easy to conduct its processing or machining and polishing treatment. This plastic optical filter includes a filter base formed of a plastic material comprising a copolymer obtained by copolymerizing a monomer represented by the following formula I: