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. 07, 1991
Filed:
Feb. 12, 1990
Applicant:
Inventors:
Masaaki Tahara, Takatsuki, JP;
Takakazu Tomoda, Sennan, JP;
Kenzo Kitano, Kawachinagaro, JP;
Teruo Minato, Hasimoto, JP;
Assignee:
Daidousanso Co., Ltd., Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148 166 ; 148 14 ; 148 203 ;
Abstract
Steel is nitrided first by treating the steel to be nitrided with NF.sub.3 at elevated temperature to form a fluorinated layer on the steel, and then the steel is nitrided by heating in a nitriding atmosphere.