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:
Oct. 14, 1997
Filed:
Jan. 19, 1996
Applicant:
Inventors:
Toshiyuki Kawamura, Hamamatsu, JP;
Hitoshi Goi, Hamamatsu, JP;
Atsushi Murayama, Hamamatsu, JP;
Hirofumi Kamisugi, Hamamatsu, JP;
Assignee:
Dowa Mining Co. Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ; C23C / ;
U.S. Cl.
CPC ...
148206 ; 148235 ; 148233 ;
Abstract
A treating material W pre-heated to a carburizing temperature of 750.degree.-950.degree. C. is heat-treated in a carburizing atmosphere directly supplied with hydrocarbon and oxidizing gases and heated to 1000.degree.-1100.degree. C. Then, the treating material W is forcibly cooled to a temperature below 600.degree. C., the treating material W is re-heated to 750.degree.-850.degree. C., and then it is hardened. Energy required to the carburization can be saved because drastic reduction of the treating time is possible.