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:
Jun. 06, 2023
Filed:
Oct. 29, 2020
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventor:
Koki Takasawa, Suwa, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G04B 37/22 (2006.01); C22C 38/48 (2006.01); C22C 38/44 (2006.01); C22C 38/42 (2006.01); C22C 38/00 (2006.01); G04B 37/00 (2006.01);
U.S. Cl.
CPC ...
G04B 37/22 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); G04B 37/0008 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01);
Abstract
A watch component comprising an austenitic ferritic stainless steel. The austenitic ferritic stainless steel includes a base portion composed of a ferrite phase, a surface layer composed of an austenitic phase, and a mixed layer formed between the base portion and the surface layer, wherein the mixed layer is composed of the ferrite phase and the austenitic phase. The surface layer contains 1.0 to 1.6 mass % of nitrogen, in which the surface layer has, at a surface of the surface layer, an oxide film having a thickness of 2.5 nm or greater, as calculated in terms of oxygen profiles in AES analysis.