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. 14, 2018
Filed:
Apr. 09, 2012
Applicant:
Chikara Ohki, Kuwana, JP;
Inventor:
Chikara Ohki, Kuwana, JP;
Assignee:
NTN CORPORATION, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21D 1/06 (2006.01); C23C 8/32 (2006.01); C21D 1/74 (2006.01); C21D 1/76 (2006.01); C21D 9/36 (2006.01); C21D 9/38 (2006.01); C21D 9/40 (2006.01); C23C 8/26 (2006.01);
U.S. Cl.
CPC ...
C23C 8/32 (2013.01); C21D 1/06 (2013.01); C21D 1/74 (2013.01); C21D 1/76 (2013.01); C21D 9/36 (2013.01); C21D 9/38 (2013.01); C21D 9/40 (2013.01); C23C 8/26 (2013.01);
Abstract
Provided is a gas nitrocarburizing method forming a nitride layer in a surface layer portion of a workpiece made of steel by heating the workpiece within a heat treatment furnace into which a heat treatment gas is introduced, the heat treatment gas containing ammonia gas and at least one of carbon dioxide gas and hydrogen gas, and having a remainder formed of an impurity.