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:
Dec. 01, 1992
Filed:
Dec. 18, 1991
Hirofumi Kamitakahara, Yokohama, JP;
Naoki Kushida, Yokohama, JP;
Hitoshi Yoshino, Kawasaki, JP;
Osamu Kanome, Yokohama, JP;
Hisanori Hayashi, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed are a master holder of a stamper electroforming apparatus and an electroforming method using this master holder. The master holder is for use in a stamper electroforming apparatus that forms a metal film by electroforming on a conductive film formed on a master having a minute relief pattern on its surface; and this master includes: a contact ring for electrically connecting the conductive film to a power source; and a structure for controlling the rate at which the metal film is formed, which structure is provided on the contact ring and adapted to control the metal-film-formation rate such that the thickness of a peripheral portion of the metal film gradually decreases in the vicinity of the contact ring.