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:
Feb. 17, 1987
Filed:
Sep. 30, 1985
Ryo Kurakata, Saitama, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
A protective and decorative coating film of a beautiful black color which is composed of a mixture of titanium nitride and titanium carbide can be deposited on the surface of various metallic articles of personal ornament use such as watch cases by the techniques of ion plating in which the gaseous atmosphere of low pressure contains argon, nitrogen and an aliphatic hydrocarbon compound such as ethylene in a limited proportion. It is disclosed that the adhesion strength of the coating film to the substrate surface is largely influenced by the oxygen content in the coating film so that it is preferable to decrease the content of oxygen in the atmosphere to such an extent that the oxygen content in the thus formed coating film does not exceed 40% in the atomic ratio.