Abstract: A rotatable electrical connector or swivel is used in a substantially vertical subterranean portion of a drill string within a drill pipe. The swivel has an enclosed oil filled chamber having a first shaft concentrically mounted therein. The first shaft protrudes from the chamber and is electrically connected to one end of a wireline which is used for electrical connection between the surface and instruments located downhole. Within the interior of the oil filled chamber the first shaft is attached to a first member disposed within the complementary surface of a second member concentrically aligned with the first member. The second member includes a second shaft which protrudes from the oil filled chamber and is connected to the other end of the wireline. One of the two shafts is rotatably mounted in bearing within the chamber so that the complementary surfaces of the first and second members are in the relationship of a rotor and stator.

Abstract: A method for providing a large number of interconnections between a circuitizable wafer and a circuitizable substrate provides very fine line interconnections with built-in strain relief. A channel between the respective substrates is filled with a solvent soluble material which is applied in a manner such that a convex or concave shape is attained in the channel between the material. A sensitizer may be mixed with the solvent soluble material prior to its placement in the channel between the substrates, and then a photoresist is applied to the composite, exposed and developed, yielding the desired circuit configuration. Next, copper leads are additively electrolessly plated to the desired thickness in the exposed circuit areas. After the leads have been formed, the solvent soluble material is removed leaving curved, strain relief leads suspended in air with the two ends interconnecting the substrates.