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:
Jul. 30, 1991
Filed:
Jul. 30, 1987
Applicant:
Inventor:
Dietrich Borse, Hamburg, DE;
Assignee:
Ernst Winter & Sohn GmbH & Co., Hamburg, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B24D / ; B24D / ; B24D / ;
U.S. Cl.
CPC ...
156646 ; 156644 ; 156D / ; 51293 ; 51296 ; 51309 ;
Abstract
Diamond grains utilized in cutting tools and usually held in a bond, specifically metallic bond are subjected to a pretreatment which enlarges their surface to at least twice their natural surface area. The pretreatment includes embedding the diamond grains in a metal powder, and exposing the embedded grains to a stream of hydrogen or hydrogen-containing gas at a temperature above 700.degree. C. until pores are etched in contact areas of the diamonds with the metal particles. The pretreated diamond grains are then purified with an acid to remove the metal particles and other residues.