PATENTS GRANTED In the Metal Finishing Field Printed copies of patents are furnished by the Patent and Trademark Office for $3.00 each. Address orders to: Commissioner of Patents and Trademarks, Washington, D.C. 2023 1.

Microgel Protective Coatings U.S. Patenf 5,508,325. Apr. 16, 1996 G.i? Craun ef al., assignors fo The Glidden Co., C/eve/and

An aqueous dispersed coating composi- tion containing a polymeric binder com- prising crosslinked microgel polymer par- ticles having a mean particle size less than one micron, the polymer particles being a carboxyl functional, carbon grafted, acryl- ic-epoxy copolymer crosslinked with a low molecular weight diepoxide resin, and where the acrylic-epoxy copolymer is pro- duced by in-situ nonaqueous copolymer- ization of ethylenically unsaturated mono- mer in the presence of epoxy resin.

Powder Coating Composition U.S. Patent 5,508,337. Apr. 16, 1996 C. Wamprecht et a/., assignors to Bayer AG, Leverkusen, Gemany

A powder coating composition having a glass transition temperature of 20 to 80°C and comprising 56 to 86.9% by weight of a polyacrylate polyol component, 0.1 to 7% of a polyester polyol component, 13 to 35% of a polyisocyanate component, and at least one catalyst for the reaction between blocked isocyanate groups and hydroxyl groups.

Two-Component Polyurethane U.S. Patent 5,508,340. Apr. 16, 1996 R.E. Hart, assignor fo R.E. Hart Labs Inc., Calif

A substantially solvent-free, aqueous, two-component coating composition dis- persion comprising an aqueous phase com- prising a polyol phase and an amine or blend of amines and a member selected from the group consisting of an aliphatic polyisocyanate, a cycloaliphatic polyisocy- anate, and an aromatic polyisocyanate and mixtures thereof.

Metallizing Process U.S. Patenf 5,509,557. Apr. 23, 1996 L.J. Jimarez et al., assignors to IBM Corp., Armonk, N. Y

A process for depositing a conductive metal onto the surface of a dielectric sub- strate selected from the group consisting of thermosetting polymeric materials and thermoplastic polymeric materials, which

comprises obtaining a metal sheet having a roughened surface, laminating the metal sheet to the dielectric substrate surface by pressing the roughened surface of the metal sheet against the surface of the substrate; removing the metal from the substrate, then seeding the substrate surface to render it active for electroless plating thereon; and plating a metal thereon from an electroless plating bath.

Blast Nozzle U.S. Patent 5,509,849. Apr. 23, 1996 W.E. Spears Jr., assignor to Church & Dwighf Co. Inc., Princeton, N.J.

An apparatus for directing a particulate abrasive against a targeted surface for cleaning contaminants therefrom, compris- ing a blast nozzle having a longitudinal bore therethrough for accelerating a stream of abrasive particles in compressed air, the bore comprising an inlet for receiving the stream, a converging section immediately downstream of the inlet, an orifice down- stream of the converging section and a diverging section downstream of the ori- fice, diverging section leading to an outlet, and means for injecting a stream of pres- surized water directly into the stream of abrasive particles and compressed air at a point downstream of the orifice.

Coating Composition U.S. Patent $509,959. Apr. 23, 1996 K.A. Nielsen and C. kt! Glancy assignors to Union Carbide Chemicals & Plastics Technology Corp., Danbuw Corm.

A precursor coating composition suit- able for admixture with at least one super- critical fluid, which admixture is then to be spayed, comprising a liquid mixture of a solids fraction containing at least one poly- meric compound capable of forming a coating on a substrate: and a solvent frac- tion containing at least one solvent in which the at least one polymeric compound is at least partially soluble.

Blast Media U.S. Patent 5,509,971. Apr. 23, 1996 1. Kirschnec assignor to Church & Dwight Co. Inc., Princeton, N. J.

A process for removing coatings from hard surfaces comprising blasting with a

free-flowing particulate blast media en- trained in a pressurized fluid, said blast media comprising a major amount of rela- tively soft granular abrasive particles, which have a Mohs hardness of less than 4.0 and a minor amount of free-flowing, separate, relatively hard granular abrasive particles, which have a hardness of greater than 5.0 on the Mohs scale, the granular abrasives having a particle size of 10 to 2,000 microns and being devoid of crystal- line silica material.

Protective Coating for Copper U.S. Patent 5,510,OlO. Apr. 23, 1996 R.G. Kobor; assignor to Catir Corp., Syracuse, N.Y:

A method of protecting a copper heat exchanger against corrosion that includes precleaning and degreasing exposed sur- faces of the heat exchanger followed by immersing in an acid bath to remove un- wanted oxides from the exposed surfaces, and then washing the heat exchanger with water; immersing the heat exchanger in an aqueous oxidizing bath for a period of time sufficient to establish a uniform black ox- ide covering exposed surfaces of the heat exchanger; rinsing after the oxidizing step in successive baths of cold water, hot wa- ter, and deionized water; and electrocoating with a nonconductive acrylic paint to pro- vide a continuous protective barrier over the exposed surfaces against corrosion.

Decorative Gold Alloy Plating U.S. Patent 5,510,012. Apr. 23, 1996 S. Schulz et al., assignors to Leybold AG, Hanau, Germany

A method for the application of a gold alloy coating having physical properties on a substrate by means of a PVD process, comprising introducing nitrogen having a concentration and a composition in a reac- tion chamber; reactively sputtering a plu- rality of particles from a target made of gold alloyed with vanadium, whereby the gold alloy coating includes vanadium ni- tride; and varying the concentration of ni- trogen during sputtering to influence the physical properties of the gold alloy coat- ing.

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