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:
Dec. 07, 1976
Filed:
Jun. 04, 1975
Applicant:
Inventors:
Takashi Tokuue, Yokohama, JA;
Takashi Kato, Yokosuka, JA;
Assignee:
Toho Chemical Industry Co., Ltd., Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ; B23K / ;
U.S. Cl.
CPC ...
148 18 ; 148 27 ; 148 28 ; 252 67 ; 252 72 ;
Abstract
A process for quench hardening metal is provided. The process comprises heating the metal to a quench hardening temperature and thereafter immersing the metal in a quenching medium which is an aqueous solution containing 0.4 to 10% by weight of polyacrylic acid, polymethacrylic acid, a copolymer of acrylic acid and methacrylic acid, or a salt thereof. The process provides a perfect and uniformly hardened quenched structure and allows the production of a quenched structure having a desired degree of hardness.