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:
Apr. 13, 1993
Filed:
Apr. 10, 1991
Applicant:
Inventors:
Kiyoshi Yamamoto, Yokohama, JP;
Keiji Hirabayashi, Tokyo, JP;
Noriko Kurihara, Tokyo, JP;
Yasushi Taniguchi, Kawasaki, JP;
Keiko Ikoma, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03B / ; C03B / ; C03B / ;
U.S. Cl.
CPC ...
427135 ; 427133 ; 427249 ; 427331 ; 4273722 ; 427523 ; 427577 ; 2491141 ; 249134 ; 6537413 ; 6537415 ; 65 26 ; 65305 ;
Abstract
This specification discloses a mold for use for press-molding an optical element, characterized in that at least the molding surface of a mold base material is coated with an a-C:H film containing 5-40 atom % of hydrogen therein and having a film density of 1.5 g/cm.sup.3 or more, and with hard carbon film containing 0-5 atom % of hydrogen therein and having a spin density of 1.times.10.sup.18 spin/cm.sup.3 or less and a film density of 1.5 g/cm.sup.3 or more.