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:
Aug. 31, 1993
Filed:
Jan. 25, 1993
Applicant:
Inventors:
Yoko Yoshinaga, Machida, JP;
Nobuo Kushibiki, Yamato, JP;
Tetsuro Kuwayama, Yokohama, JP;
Naosato Taniguchi, Atsugi, JP;
Hiroyoshi Kishi, Atsugi, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03H / ;
U.S. Cl.
CPC ...
430-1 ; 430-2 ; 430290 ; 359-1 ; 359-3 ;
Abstract
A volume phase type hologram film has a diffraction grating recorded in a film composed mainly of poly(N-vinylcarbazole). The poly(N-vinylcarbazole) as the main component has a weight-average molecular weight of not less than 1,000,000 and a molecular weight distribution of not more than 3. In the poly(N-vinylcarbazole), the content of a fraction of poly(N-vinylcarbazole) having a weight-average molecular weight of not more than 200,000 does not exceed 1% by weight.