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:
Feb. 17, 1976
Filed:
Oct. 02, 1973
Applicant:
Inventors:
Takashi Tokuue, Yokohama, JA;
Takashi Kato, Yokosuka, JA;
Assignee:
Toho Chemical Industry Co., Ltd., Tokyo, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
148 28 ; 252 67 ; 148 18 ; 148 27 ;
Abstract
A novel quenching medium for steel is provided. The quenching medium is a 0.5-10 wt. % aqueous solution of polyacrylic acid, polymethacrylic acid, a copolymer of acrylic acid and methacrylic acid, or a salt thereof. Intrinsic viscosity [.eta.] of the polymer is from 0.010 to 0.050 l/g. The quenching medium is superior in various quenching characteristics to conventional quenching media.