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, 1985
Filed:
May. 28, 1982
Robert J Housman, Irvine, CA (US);
Other;
Abstract
A wear insert for earth boring tools, such as drill bits, has diamonds imbedded in a sintered matrix of tungsten-carbide and Invar. The matrix prior to sintering has a particle size of from about 0.5 to about 10 microns. Invar represents from about 3% to about 20% by weight of the matrix. The diamonds are arrayed in a desired pattern in a matrix preform; compression of the resultant preform at pressures of from about 10 to about 20 tons per square inch consolidates preform. The consolidated preform is sintered at a temperature just below the melting point of Invar in a neutral atmosphere of nitrogen and hydrogen formed of dissociated ammonia. Nitrogen results in the wetting of the diamonds. Hydrogen presents a reducing atmosphere.