comprising treating the substrate with an potassium ion, 50 g/L saturation of boric effective amount of a stilbene-based fluo- acid, 30-45 g/L of formate ion, S-30 g/L of rescent brightener to sensitize the substrate bromide ion, and 75-250 ppm of a wetting and thereafter contacting with an elec- agent, the solution being substantially free troless copper plating solution. of ammonium ion.

Thickness Measurement Gauge U.S. Pafent5,293,132. Mar. 8, 1994 F.J. Koch, assignor to DeFelsko Corp., Ogdensburg, N.K

A gauge for measuring the thickness of a coating on a substrate of an element, comprising a probe assembly for contacting a substrate having a coating; transducer means for providing a usable output in response to the thickness of the coating; and a housing encircling the probe assem- bly.

Trivalent Chromium Bath U.S. Pafenf5,294,328. Mar. 15, 1994 G. E. Shahin, assignor to E/f A&hem Nodh America Inc., PhiIadeIphk?

An improved solution for electroplating chromium and chromium alloy, comprising an electroplating solution having 5-60 g/L of trivalent chromium ion, 200-300 g/L of

Powder Coating System U.S. Patent5,298,037. Mar. 22, 1994 D. Se&r and H. Holler, assignors to Gema Volsfafic AG, St. Gal/en, Switzerland

An electrostatic powder spray coating system for car bodies.

Pretreatment Process For Tin- Lead Plating U.S. Patent 5296,268. Mar. 22, 1994 R.A. lantosca, assignor to Shipley Co. Inc., Marlbor- ough, Mass.

A process for plating a tin-lead alloy on cupreous substrates by displacement plat- ing from an immersion plating solution having a pH varying between 0.0 and 1.5 containing dissolved tin and lead salts, said process comprising pretreatment by contact with a solution containing an acid pH adjustor followed by contact with the immersion plating solution.

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Electroless Copper Plating Bath U.S. Patent 5298,058. Mar. 29, 1994 F. Ma&i and Y Yamemoto, assignors to C. Uyemura 8 Co. LM., Osaka, Japan

An electroless copper plating bath com- prising a water-soluble salt of copper, a complexing agent, and a reducing agent consisting of a phosphorous acid or a phosphite, said bath having an acidic pH.

Plural-Component Spray Gun U.S. Patent $299,740. Apr. 5, 1994 J.D. Bert, assignor to Binks Manufacturing Co., Frank/in Park, 111.

A plural-component mixing and dis- pensing spray gun, comprising a gun body, an airless tip, and means for intermittently feeding streams of reactant liquids.

Composite Electroless Plating Compositions U.S. Patent 5,300,330. Apr. 5, 1994 N. Fekfsfein and D. Lindsay, assignors to Surface Techno/ogy Inc., Trenton, N.J.

An improved electroless plating process including the step of contacting a substrate with a composition comprising a source of

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