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:
Oct. 13, 1998
Filed:
Oct. 05, 1995
Masuhiro Shouji, Iwaki, JP;
Takeo Ogihara, Iwaki, JP;
Hiroki Katono, Iwaki, JP;
Teruo Sakagami, Iwaki, JP;
Hiroshi Hasebe, Urawa, JP;
Haruyoshi Takatu, Higasiyamato, JP;
Kureha Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Dainippon Ink and Chemicals, Inc., Tokyo, JP;
Abstract
A polymeric optical low-pass filter of the birefringent type is provided which is lightweight and small, and which can be easily produced. Also provided are a polymeric optical low-pass filter device including the polymeric optical low-pass filter; and a composite optical filter including the polymeric optical low-pass filter. The optical low-pass filter comprises an optically anisotropic polymer film in which the displacement distance S between the ordinary ray and the extraordinary ray represented by the following formula is 1-70 .mu.m: