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. 26, 1988
Filed:
Oct. 21, 1986
Applicant:
Inventors:
Nobuhiko Kawatsuki, Kurashiki, JP;
Masao Uetsuki, Kurashiki, JP;
Assignees:
Kuraray Co., Ltd., both of, JP;
Toshiba Corp., both of, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
35016221 ; 35016223 ;
Abstract
A combination pattern-refraction modification type phase grating comprises dual grating elements which are regularly arranged and each includes convex and concave portions which have respectively different thickness and are formed of material respectively different in refractive index so as to combine respective characteristics of a pattern and a refraction modification type phase grating.