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:
Mar. 05, 1985
Filed:
Apr. 28, 1983
Applicant:
Inventor:
Kazuo Asaka, Chiba, JP;
Assignee:
Hitachi Powdered Metals Co., Ltd., Chiba, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B22F / ;
U.S. Cl.
CPC ...
419-6 ; 419-5 ; 419 48 ;
Abstract
A process for making a mechanical part of a complicated profile by preparing a compact having a projection or shaft (hereinafter called the inner part) and a compact having relative recess or opening (hereinafter called the outer part) by the compression of iron base metal powders, and by fitting the inner part into the outer part followed by sintering. This process is characterized in that the said inner part contains carbon as an essential component in an amount that is larger than the carbon content of the said outer part by 0.2% by weight or higher.