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. 24, 1995
Filed:
Sep. 16, 1994
Applicant:
Inventors:
Sigeru Hashimoto, Yokohama, JP;
Akihiko Yokoyama, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
428432 ; 428212 ; 428701 ; 428702 ; 359580 ; 359586 ;
Abstract
Alternating films consisting of alternations of high refractive index films and low refractive index films are provided on a transparent substrate such that the high refractive index film is adjacent to the substrate. The low refractive index films are composed of Al.sub.2 O.sub.3. The high refractive index films are composed of at least a component selected from a group consisting of TiO.sub.2, Ta.sub.2 O.sub.5, HfO.sub.2, ZrO.sub.2, Nb.sub.2 O.sub.5, mixture thereof and modified substances thereof.