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:
May. 09, 2017
Filed:
Apr. 12, 2012
Yuichi Furukawa, Toyota, JP;
Masahiro Okumiya, Nagoya, JP;
Yoshiki Tsunekawa, Nagoya, JP;
Nao Kumemoto, Nagoya, JP;
Fumio Kawahara, Toyota, JP;
Katsuhiro Takami, Toyota, JP;
Yuichi Furukawa, Toyota, JP;
Masahiro Okumiya, Nagoya, JP;
Yoshiki Tsunekawa, Nagoya, JP;
Nao Kumemoto, Nagoya, JP;
Fumio Kawahara, Toyota, JP;
Katsuhiro Takami, Toyota, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, Aichi-ken, JP;
TOYOTA SCHOOL FOUNDATION, Nagoya-shi, Aichi-ken, JP;
MEC INTERNATIONAL CO. LTD., Toyota, Aichi, JP;
Abstract
A surface treatment method for a metal material is provided which includes applying diluted sulfuric acid to a surface of the metal material that is composed primarily of iron, performing a heat treatment on the metal material in the presence of at least one of CO, COand organic gas under nitriding conditions under which a nitrided layer is formed in a superficial layer of the metal material after the application of the diluted sulfuric acid to form a carbon film which includes at least one of carbon nanocoils, carbon nanotubes and carbon nanofilaments on a surface of the nitrided layer of the metal material.