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:
Apr. 04, 2017
Filed:
Apr. 25, 2012
Applicants:
Takumi Fujita, Kuwana, JP;
Kazuhiro Yagita, Kuwana, JP;
Inventors:
Takumi Fujita, Kuwana, JP;
Kazuhiro Yagita, Kuwana, JP;
Assignee:
NTN CORPORATION, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23C 8/34 (2006.01); C21D 1/76 (2006.01); C21D 9/40 (2006.01); C23C 8/32 (2006.01); C21D 1/06 (2006.01); C23C 8/02 (2006.01); C23C 8/80 (2006.01); C23C 28/04 (2006.01); F16C 33/64 (2006.01);
U.S. Cl.
CPC ...
C23C 8/34 (2013.01); C21D 1/06 (2013.01); C21D 1/76 (2013.01); C21D 9/40 (2013.01); C23C 8/02 (2013.01); C23C 8/32 (2013.01); C23C 8/80 (2013.01); C23C 28/042 (2013.01); F16C 33/64 (2013.01);
Abstract
A method of manufacturing a machine component includes the steps of: preparing a member made of steel; forming a film containing vanadium at a surface by subjecting the member to oxidation; and forming a nitrogen-enriched layer by heating the member having the film formed in a heat treatment gas atmosphere containing nitrogen gas and absent of ammonia gas for carbonitriding.