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:
Jan. 10, 1995
Filed:
Dec. 22, 1992
Applicant:
Inventor:
Rolf Svensson, Hagersten, SE;
Assignee:
Sandvik AB, Sandviken, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25F / ; C23F / ;
U.S. Cl.
CPC ...
2041291 ; 2041298 ; 20412995 ; 20412935 ; 20412946 ; 156656 ;
Abstract
The present invention relates to an etching process for the purpose of removing binder phase from the surface of a hard metal consisting of hard material in a binder phase based on cobalt and/or nickel. By carrying out the etching process electrolytically in a mixture containing concentrated sulfuric acid and concentrated phosphoric acid at a volume ratio of 0.5-2 with a water content of <50% at a temperature of 25.degree.-60.degree. C. an even binder phase removal without deep penetration is achieved.