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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.:

US 5202156 B1

PDFFull Text
Date of Patent:
Apr. 13, 1993

Filed:

Apr. 10, 1991

Method of making an optical element mold with a hard carbon film

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:

Fitzpatrick, Cella, Harper & Scinto

Primary Examiner:

W Gary Jones

Assistant Examiner:

Todd J Burns

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.

Find Patent Forward Citations

Yamamoto, Kiyoshi. (1993). Method of making an optical element mold with a hard carbon film (U.S. Patent No. 5202156). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5202156

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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