Electrocoat Painting Method U.S. Patent 5,591,316. Jan. 7, 1997 H.F. Hess. Jr. and H.F. Hess. 111, assignors lo UFS Corp., Valparaisc, Ind.

A method for electrocoat painting of a counrerelectrode in a paint bath tank com- prising positioning tubular membrane elec- trode cells in the paint bath tank. wherein the membrane electrode cells have a tubu- lar guard concentrically positioned around the membrane.

Surface Mount Printed Wire Boards U.S. Pafeent 5591,353. Jan. 7, 1997 J.J. Davigncn et ai., assignors to Texas instruments Inc., Dallas

A method of making a printed wiring board comprising providing a board having a pair of major opposing surfaces, a via having walls extending between the sur- faces and a layer of electrically conductive material having thickness disposed on at least one surface and extending along rhe walls of the via; protecting the electrically conductive material disposed in the via against a subsequent etching of the electri-

cally conductive material on at least one surface: and reducing the thickness of elec- trically conductive material.

Etching Plastics With Nitrosyls U.S Patent 5,591,354. Jan. 7. 1997 G N. Pate1 and S.H. Pate/> ass,gnors to JP Laborafories Inc., Mdd!esex, N.J.

A process of etching the surface of ma- terials made of polymers having at least one oxidatively degradable functionality. which comprises treating the surface with a solution of at least one member of the etchant group consisting of nitronium. ni- trosonium ions, and complexes thereof in a solvent containing less than 40% by weight of water and nitroacidium ions and com- plexes thereof.

Stripping Compositions U.S. Patent 5,591,702. Jan. 7. 1997 D.P Murphy. assIgnor to Henkei Corp., Plymouth Ikfeeeeting, Mass

A composition useful as an additive to alkaline stripping compositions to increase the speed of stripping, consisting of a com- bination of solvents selected from EGMFE

and TPG; DEGMPE and MEA; TEGMME and MEA; and others.

Shot Peening Method U.S. Patent 5,592,&U Jan 14, 1997 J.M Champaigne Souih Bend, Ind.

A shot peening method comprising the steps of providing a transport hose with a nozzle attached at an end thereof; convey- ing shot into rhe nozzle other than through the transport hose at a predetermined mass flow rate. supplying gas under pressure to the hose through an inlet openmg for ac- celerating the shot in the nozzle, discharg- ing the shot at a workpiece being treated, determining from a look-up table the pres- sure levels in the hose at a first measuring point at the nozzle and at a second measur- ing point upstream from the first measuring point required to establish a desired shot velocily at the predetermined ihot mas$ flow rate, controlling the pressure of the gas supplied to the hose; monitoring the pressure levels during treatment of the workpicce; and discontinuing treatment when a change of either of the pressure levels Indicates a velocity of the particles being transported through the hose rhat is other than the desired velocity.

trioneticq, inc. (216) 425-2846 ??FAX (216) 4253704

2021 MIDWAY DRIVE, TWINSBURG, OHIO 44067

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Now you can Eliminate Racking of Semi-Conductors, Electronic Parts, etc. by Barrel Plating with CMC Plastic Balls. Balls are reuseable- designed for all types of metal.

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CMC Plastic Balls make barrel plating of small parts possible-even flat discs and interlocking items! Because CMC Plastic Balls are copper plated, they can easily be mixed with other items to be plated or burnished. The balls are not lacquered and therefore are conductive, yet CMC Plastic Balls are so Ii ht in wei no problem at all. C 9 C Plastic !I

ht that sifting is alls pay for

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METAL FINISHING ?? NOVEMBER 1997 103