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:
Aug. 01, 2000
Filed:
Mar. 02, 1999
Applicant:
Inventors:
Ryota Koike, Tokorozawa, JP;
Yukio Miya, Kawagoe, JP;
Osamu Sugiyama, Tokorozawa, JP;
Takashi Toida, Tokyo, JP;
Toshiichi Sekine, Kamifukuoka, JP;
Assignee:
Citizen Watch Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05H / ; C23C / ;
U.S. Cl.
CPC ...
427577 ; 427237 ; 4272497 ;
Abstract
A hard carbon film is formed over an inner surface of a guide bush by the steps of disposing the guide bush in a vacuum vessel, inserting an electrode into a center bore of the guide bush and applying a positive current to the electrode, introducing a gas, containing carbon, through a gas inlet port into the vacuum chamber after evacuating the vacuum vessel, and producing a plasma in the vacuum vessel to form a hard carbon film of hydrogenated amorphous carbon over the inner surface of the guide bush by a plasma CVD method.