Abstract: A heat exchanger, or the heat exchanger component of a multi-function device, comprising a polymeric heat transfer material. The heat exchanger exhibits reduced voltage-induced breakdown of the polymeric material, which can lead to cross-contamination of the two fluids. Either or both of two approaches may be employed. The first approach modifies the polymeric material to increase its resistance to breakdown. The second approach employs at least one electrical bridge between the fluids in the two sides of the heat exchanger, thus placing the two fluids into electrical equilibrium.

Abstract: Conventional drag bits for diamond insert studs generally require a two-step operation which includes a first drilled hole to accept the grip length of the diamond stud. A second counterboring operation relieves the upper portion of the bored hole to clear the bottom edge of the diamond cutting face of the insert. Counterboring also facilitates insertion of the studs within the hole. Conventional insertion methods for the studs unfortunately leave a portion of the insert vulnerable to breakage because the back side of the insert opposite the cutting face is unsupported. This invention corrects this problem by drilling the counterbore hole eccentrically with respect to the insert hole so that the counterbore surface is, for example, tangent with the insert hole at a point opposite the cutting face of the insert stud, thus providing support for the upper portion of the stud during operation of the drag bit.

Abstract: Conventional drag bits for diamond insert studs generally require a two-step operation which includes a first drilled hole to accept the grip length of the diamond stud. A second counterboring operation relieves the upper portion of the bored hole to clear the bottom edge of the diamond cutting face of the insert. Counterboring also facilitates insertion of the studs within the hole. Conventional insertion methods for the studs unfortunately leave a portion of the insert vulnerable to breakage because the back side of the insert opposite the cutting face is unsupported. This invention corrects this problem by drilling the counterbore hole eccentrically with respect to the insert hole so that the counterbore surface is, for example, tangent with the insert hole at a point opposite the cutting face of the insert stud, thus providing support for the upper portion of the stud during operation of the drag bit.