General Electric Company

Gary W Smith

Gary Martin Flood

David E Slutz

Paul D Gigl

Sandeep Kumar Dhawan

Bimal Ramesh Patel

An improved process for the preparation of high molecular weight, linear polyester resins comprises reacting an aromatic dicarboxylic acid with an excess of an alkane diol under conditions effective to reach the clearing point of the reaction; pre-condensing the cleared reaction mixture under conditions effective to produce oligomers having an intrinsic viscosity measured in 60/40 phenol/1,1,2,2-tetrachloroethane at 25&deg; C. of less than about 0.70 deciliters/gram and a carboxylic acid end group level of less than or equal to about 100 milliequivalents per kilogram; and polycondensing the oligomer under conditions effective to produce a linear polyester resin having an intrinsic viscosity less than or equal to about 2.0 dl/g as measured in 60/40 phenol/1,1,2,2-tetrachloroethane by weight at 25&deg; C. and a carboxylic acid end group level of about 10 to about 40 milliequivalents per kilogram.

Crystalline polyester resins and processes for their preparation

Crystalline polyester resins and process for their preparation

Disclosed is a brazed implement comprising a thermally-stable polycrystalline diamond compact, e.g. a compact of self-bonded diamond particles having a network of inter-connected empty pores dispersed throughout the compact, bonded to another of said compact or bonded to a cemented carbide support by a brazing filler metal disposed therebetween. The brazing metal comprises an alloy having a liquidus above about 700.degree. C. and containing an effective amount of chromium. Translational shear strengths exceed about 50 kpsi even upon furnace cycling of the brazed implements and often exceed 90 kpsi. The method for fabricating the brazed implement also is disclosed.

Brazed thermally-stable polycrystalline diamond compact workpieces

Brazed thermally-stable polycrystalline diamond compact workpieces and

Disclosed is an improved brazed implement comprising a composite compact having an abrasive particle layer bonded to a support and a substrate bonded to the support by a brazing filler metal having a liquidus substantially above 700.degree. C. disposed therebetween. In a preferred embodiment the composite compact comprises a sectioned cylindrical composite compact having a lower support surface opposite the support surface bonded to said abrasive particle layer. The composite compact also has a mating surface. The substrate about its upper end has a pocket which comprises an interior face complementary in shape with the compact lower support surface and a land complementary in shape with the compact mating surface. The compact is brazed to the substrate. The abrasive particle layer is spaced-apart from contact with the substrate a distance adequate to minimize thermal damage thereto during the brazing of the compact to the substrate. The land is of sufficient depth, however, to provide support for the compact. The preferred composite compact comprises a polycrystalline diamond compact bonded to a cemented carbide support. The preferred substrate is a cemented carbide substrate. The improved implement has special utility in drill bits for oil and gas exploration and in mining applications.

Pocketed stud for polycrystalline diamond cutting blanks and method of

Disclosed is an improved fixture assembly for use on an electrode wire EDM apparatus which is adapted to cut a conductive workpiece. Referring to FIG. 2, the improved fixture which can secure a plurality of workpieces 52 comprises master bar 40, which is secured to work supports 30 transversely therebetween, base plate 42 which is removably attached to the master bar at a predetermined location thereof and which has a plurality of equally-spaced support locations upon which each said workpiece rests, locator plate 44 which is removably attached to the base plate at a predetermined location thereof and which has a plurality of equally-spaced recesses of predetermined shape along an edge thereof for a side of each workpiece to be held thereagainst, and a plurality of pre-configured clamps 48 removably attached to the upper side of said locator plate which are tightenable to exert force against the top surface of each workpiece for securing the workpiece in a precise location for cutting. The edgewise profiles of all components of said fixture are adapted so that each workpiece is secured and all components are non-interfering with the predetermined cutting path. The preferred workpieces comprise polycrystalline abrasive compacts typified by polycrystalline diamond compacts preferably supported on a metal support.

Growing community of inventors

New Albany, OH, United States of America

Gary W Smith