Abstract: A printed circuit assembly includes a printed circuit board with an electrically conductive via formed therein that extends from the front side of the printed circuit board to the back side of the printed circuit board. A ball grid array package mounted to the front side of the printed circuit board is electrically connected to the electrically conductive via. A probe pad formed on the back side of the printed circuit board is laterally displaced from the electrically conductive via and is electrically connected thereto. A solder mask layer deposited on the back side of the printed circuit board includes a probe pad aperture formed therein that is substantially aligned with the probe pad so that the probe pad is exposed by the probe pad aperture formed in the solder mask layer.

Abstract: An edge connector interposing probe (100) for testing the operation of two electrical assemblies which normally couple to one another via edge connectors. The interposing probe has a male edge connector (208/210) which fits into an edge connector of the first assembly, and a female edge connector (102) which receives an edge connector of the second assembly. Solder tails (200, 202) of the interposing probe's female edge connector are coupled to traces (208, 210) of the interposing probe's male edge connector, and to transmission paths (204) in one or more flex circuits (106). Signals flowing between the interposing probe's edge connectors are sensed by the transmission paths of the flex circuit(s) and routed to test connectors (108, 110, 112, 114, 116). Probe tip resistors (422, 424) can be coupled to the transmission paths at points which are proximate to the interposing probe's edge connectors.

Abstract: A recreational storage and audio apparatus 10 is provided with a chest 12 having an open area 24 formed therein and a lid 36 for covering the open area. A pair of wheels 54 is coupled to a bottom wall 22 of the chest 12. A first handle 62 is pivotably coupled to one end of the chest 12 and a second handle 68 is mounted for slidable movement in the chest adjacent another end of the chest. The second handle 68 is provided to be used in conjunction with the first handle 62 when the second handle is moved to a first position to allow the chest 12 to be picked up and carried and is provided to be used in conjunction with the wheels 54 when the second handle is moved to a second position to allow the chest to be moved on the wheels and rolled in a horizontal direction. Additionally, an AM/FM radio 100, cassette player 110, and compact disc player 120 are coupled to and supported on the lid 36.

Abstract: A method for testing leads of an integrated circuit package. The method includes a testing substrate with a plurality of conductive portions for use in connection with a test probe. The method further includes at least one compressible conductive bridge member for providing electrical contact between the leads of the integrated circuit package and the conductive portions of the testing substrate. The conductive bridge member has multiple electrically conductive wires embedded therein or secured thereto, each of the wires being parallel to one another and spaced apart from one another. The method uses a frame for retaining the conductive bridge members therein and maintaining the conductive bridge members in electrical contact with the leads of the integrated circuit package and the conductive portions of the testing substrate.

Abstract: An assembly and method for testing leads of an integrated circuit package. The assembly includes a testing substrate with a plurality of conductive portions for use in connection with a test probe. The assembly further includes at least one compressible conductive bridge member for providing electrical contact between the leads of the integrated circuit package and the conductive portions of the testing substrate. The conductive bridge member has multiple electrically conductive wires embedded therein or secured thereto, each of the wires being parallel to one another and spaced apart from one another. The assembly uses a locator device for retaining the conductive bridge members therein and maintaining the conductive bridge members in electrical contact with the leads of the integrated circuit package and the conductive portions of the testing substrate.

Abstract: A vanadium-containing catalyst system particularly suited to the polymerization of blow moldable olefin polymers. The catalyst system includes a supported, first catalyst component prepared by contacting preheated silica, with (1) a compound or complex which includes at least one carbon to magnesium covalent bond and (2) a compound which includes at least one carbon to Group III metal covalent bond. The sequence of contact of the silica with compound or complex (1) and compound (2) is optional. However, unless the compound or complex (1) and the compound (2) contact the silica simultaneously, the product of this contact is next contacted with whichever of compound (1) or (2) does not initially contact the silica. The product of the step of contacting with compounds (1) and (2) is contacted with a vanadium compound which includes at least one halogen atom. Finally, the product of the vanadium compound contacting step is contacted with an alcohol.

Abstract: A catalyst component useful in propylene polymerization in combination with a dialkyl aluminum halide cocatalyst comprises the product of reaction of TiCl.sub.3 which is substantially free of extraneous halide with a selected electron donor compound which is dissolved in a liquid hydrocarbon solvent in which the TiCl.sub.3 is dispersed. The electron donor compound is selected from certain organic acid esters, hindered phenolic compounds and silyl esters.The catalyst of the invention provides increased activity, molecular weight control, increased isotacticity of propylene polymer products and prevents catalyst feed line pluggage, among other advantages.

Abstract: A catalyst component useful in propylene polymerization in combination with a dialkyl aluminum halide cocatalyst comprises the product of reaction of TiCl.sub.3 which is substantially free of extraneous halide with a selected electron donor compound which is dissolved in a liquid hydrocarbon solvent in which the TiCl.sub.3 is dispersed. The electron donor compound is selected from certain organic acid esters, hindered phenolic compounds and silyl esters.The catalyst of the invention provides increased activity, molecular weight control, increased isotacticity of propylene polymer products and prevents catalyst feed line pluggage, among other advantages.

Abstract: An analyzer to detect a specific gas in the atmosphere by infrared absorption, having a porous tube surrounding an enclosed column of air, the porous tube having an average pore size to permit gas to diffuse through it quickly, and having within the tube an infrared source, an infrared detector and an optical filter that passes those portions of the infrared spectrum most strongly absorbed by the gas, the analyzer having a time base generator to pulse the infrared source and electronic means to measure the maximum and minimum signals from the detector and a meter to indicate the difference between the maximum and minimum as a measure of the amount of the gas in the column of air.

Abstract: A system for properly vertically positioning and stabilizing a golf club which may be utilized with either a putter or a driving wood wherein a rotatable circular roller is mounted on either the toe or the heel of the golf club and provides for proper vertical positioning and stabilization of the club face during either the putting or driving stroke with respect to the center of mass of the ball.