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

Burnishing Compound U.S. Patent 5,264,593. Feb. 8, 1994 M.M. Baevsky, assignor to Rob-Finish Co. Inc., Kalamazoo, Mich.

A composition for lubricating media utilized in a burnishing operation compris- ing a sufficient amount of a nonchelating acid to inhibit the formation of metal hydroxides, and a sufficient amount of an alkyl betaine to lubricate the media, and to increase the luster and brightness of articles burnished therewith, said composition being free of effective amounts of chelating agents.

Spray Etching Apparatus U.S. Patent 5,290,364. Mar. 1, 1994 K.F.G. Ketelhohn and D.F. Ball, assignors to Chemcut Corp., State Cottege, Pa.

An apparatus for spray etching panels and the like, comprising chamber means providing a generally confined spray etch chamber with at least one bank of spray nozzles disposed therein and with panel inlet and outlet openings, and means for delivering panels longitudinally through the chamber.

Silver-Graphite Dispersion Electrodeposit U.S. Patent 5,290,422. Mar. 1, 1994 U. MichelsenMohammadein, assignor to Siemens AG, Munich, Gemrany

A process for applying silver-graphite dispersion electrodeposits using an electro- lyte containing alkali metal silver cyanide, a conducting salt, graphite, a wetting agent, and a brightener, wherein the silver-graph- ite dispersion electrodeposits are applied using an electrolyte with a conducting salt without free cyanide.

Nonchromate Conversion Coating U.S. Patent 5,298,092. Mar. 29, 1994 M. P. Schriever, assignor to The Boeing Co., Seattle

A process for forming an oxide film cobalt conversion coating exhibiting corro- sion resistance and paint adhesion proper- ties on a metal substrate, wherein the substrate is selected from the group consist- ing of aluminum, aluminum alloy, cad-

mium plating, zinc plating, zinc-nickel diameter of 5&1,000 microns, said parti- plating, and steel. cles having a Mohs hardness of 2.0-5.0.

Electroless Copper Plating Bath U.S. Patent 5,306,336. Apr. 26, 1994 NM. Martyak et al., assignors to Monsanto Co., St. Louis

Nickel and Manganese Containing Zinc Phosphate Films U.S. Patent 5,312,492. May 17, 1994 J. Riesop et al, assignors to /-/enke/ KG, Germany

A sulfate-free electroless copper bath consisting of cupric ions; cuprous ions; formaldehyde; formate ions; hydroxy ions; alkali metal ions; monovalent counterions for ionic copper selected from the group consisting of acetate, formate, sulfamate, methylsulfate, nitrate, trichloroacetate, and trifluoroacetate; a cuprous ion chelant; and a cupric ion chelant selected from the group consisting of an alkali metal salt of one or more of aminotris(methylenephosphonic acid), biscarboxymethylaspartic acid, eth- ylenediaminetetra(methylenephosphonic acid), diethylenetri-aminepenta (methyle- nephosphonic acid), gluconic acid, l-hy- droxyethyl-idene- 1, I-diphosphonic acid, mucic acid, D-saccharic acid, N,N,N, N,- tetrakis (2-hydroxypropyl) ethylenedi- amine, and nitrilotriacetic acid.

A chlorate-free and nitrite-free process for the production of nickel and manganese containing zinc phosphate coatings on steel, zinc, or alloys thereof, said process comprising spray coating, spray coating and dip coating, or dip coating with an aqueous solution containing 0.8-l .O g/L of zinc (II), 0.8-1.0 g/L of manganese (II), 0.2-0.4 g/L of iron (II), OS-O.7 g/L of nickel (II), 12.0-16.0 g/L of phosphate ions, 3.0-6.0 g/L of nitrate ions, and 0.3-0.8 g/L of 3-nitrobenzene sulfonic acid, the aqueous solution having a free acid content of OS-l.8 points, a total acid content of 15-35 points, and the quantity of sodium required to establish the free acid content.

Processes for Coloring Anodized Aluminum

Pre-Etch Treatment for Plastic U.S. Patent 5,308,367. May 3, 1994 B.S. James, assignor to Elf Atochem North America Inc., Philadelphia

U.S. Patent 5,312,541. May 17, 1994 J-F. Pa&t et al., assignors to Sam&x Ltd., Base/ and Schweizerische Aluminum AG, Chip@, Switzerland

A method of preparing the surface of a polycarbonate, polysulfone, or polyester for plating with a metal, which method com- prises applying a solvent composition con- sisting essentially of an aqueous solution containing a component selected from the group consisting of diethylene glycol mon- obutyl ether acetate, diethylene glycol monoethyl ether acetate, and mixtures thereof.

Less Aggressive Blast Media U.S. Patent 5,308,404. May 3, 1994 B.S. Yam et al., assignors to Church & Dwight Co. Inc., Princeton, N.J.

A process for coloring oxide layers on anodized aluminum or aluminum alloys comprising treating with a water-soluble acidic composition comprising a tin (II) electrolyte, and a stabilizing agent selected from the group consisting of Camino- diphenylamine-2-carboxylic acid, diphenyl- amine-4-sulfonic acid, 2-amino-diphenyl- amine-4-sulfonic acid, Camino-diphenyl- amine-2-sulfonic acid, 4,4’-diamino- diphenylamine-2-sulfonic acid, 4’-amino- 4nitrodiphenylamine-2-sulfonic acid, 1 - amino-2,4-di(phenylamino)benzene-5-sul- fonic acid, and diphenylamine -4,4’-disul- fonic acid, and mixtures thereof.

A process for removing contaminants from substrates comprising blast cleaning with a media comprising water-soluble abrasive particles formed by compacting fine particles having an average diameter of from submicron to less than 200 microns into larger particles having an average

Jet Spray Cleaning System U.S. Patent 5,315,793. May 31, 1994 R. \/: Peterson and W KroneSchmidt, assignors to Hughes Air&t Co., Los Ange/es

A system for precision cleaning of contaminants from a surface of a substrate, comprising at least one jet spray device and

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