inhibitor; immersing the phosphate-coated metal parts contained on a rack or in a rotatable porous barrel in an aqueous dis- persion, emulsion, or solution of a cathodic or anodic thermosetting resin and passing through the parts an electric current to elec- trodeposit resin particles; contacting with an aqueous composition prior to curing of the first resin film to form a second film of the aqueous composition over the first film as a seal coat; and curing by subjecting the parts to an elevated temperature, wherein the small metal parts comprise nuts, bolts, fasteners, screws, small subassemblies, and mixtures thereof.

Printed Circuit Board U.S. Went 5603,847. Feb. 18, 1987 J.R. Howard et a/., assignors to Zycon Corp., Santa Clara. Calif.

A method of forming a circuit component assembly in a conductive layer of a printed circuit board (PCB), comprising forming an annular recess in the conductive layer about a conductive element comprising one of a through-hole and a central conductor in the PCB; forming a circuit component assembly in the annular recess, the circuit component

assembly including at least one circuit com- ponent body and having an outer perimeter interconnected with the conductive layer; and operatively interconnecting the conductive element with an inner perimeter of the circuit component assembly.

Method for Etching Through a Substrate U.S. Patent 5,603,848. Feb. 18, 1997 H.R. Beratan et ali assrgnors to Texas instruments hc , Dallas

A method for etching through unmasked regions on one side of a substrate having both masked and unmasked regions to a coating disposed on the opposite side of the substrate comprising forming a number of contacts on the one side of the substrate to shield masked regions during irradiation of unmasked regions; forming a mask layer over a portion of each of the contacts to define in part the masked region; exposing the substrate to an etchant: and irradiating the substrate while exposed to the etchant with ultraviolet electromagnetic radiation to substantially increase reactivity between the unmasked regions and the etchant such that the etchant removes the unmasked rc-

gions substantially fa~,ter than the masked regions shielded by the contacts.

Zinc Phosphate Conversion Coatings U.S. Patenf 5,604,040. Feb. 18, 1997 T. Sugama, assignor to Associated Universities Inc., Washington, D.C.

A method of coating an electiogalva- nized steel base, which comprises contact- ing the base with a composition containing aqueous zinc phosphate; a transition-metal compound promoter selected from the group consisting of a manganese, iron, co- balt, nickel, or copper compound; a poly- electrolyte selected from the group consist- ing of polyacrylic acid. polymethacrylic acid, polyitaconic acid, and poly-L- glutamic acid, said polyelectrolyte being present from 0.5 to 5.0% by weight of the total composition. and a source of iron.

Strippable Film Coating Composition U.S. Patent 5.604,282. Feb. 18. 1997 G.W. Grogan and R.H. Boyd, assignors to Groco Specialty Coafings Co., Dallas

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METAL FINISHING . NOVEMBER 1997 117

A mixture for forming a shippable film coating comprising a polyvinyl polymer.

Blast Media with Defoamers U.S. Pabnf 5,605,491. Feb. 25, 1997 B.S. Yam and A. Logan, assignors to Church & Dwibht Co. Inc., Princeton, N.J.

A blast media for use in wet abrasive blasting of a targeted surface to remove contaminants therefrom comprising abra- sive particles, at least one surfactant, and a defoaming agent.

Abrasive Blasting Gun U.S. Patenf 5,605,496. Feb. 25, 1997 R. W Pickard, assignor to The Pickard’s Trust, McLoud, CM.

An abrasive blasting gun for use in sand- blasting comprising barrel means for hold- ing a flexible tube in a straight path be- tween a rear end and a front end of the barrel means; a pinch point provided on the barrel means on one side of the flexible tube; a trigger for pivoting a lever away fmm the pinch point when the trigger is depressed; and a delivery end of the flexi- ble tube removably secured to a nozzle

provided at th.e front end of the barrel means.

Air/Abrasive Mixing Device U.S. Patent 5,605,497. Feb. 25, 1997 R. W. Pickam: assignor to The Pickatis Trusf, McLoud, Ok/a.

A device for mixing air and abrasive for use in abrasive blasting comprising an up- per chamber for receiving abrasive; means for regulating introduction of air into the upper chamber; an air delivery line extend- ing between the upper chamber and a re- ceiving end of a mixing chamber; adjust- able valve means for admitting abrasive into the mixing chamber from the upper chamber; and means for flexibly attaching a delivery gun to the dispensing end of the mixing chamber.

Ion Exchange Process U.S. Patent 5,605,563. Feb. 25, 1997 D.K. Kidby and D.M. Menne, assignors to Ann Huber, Eelwccd, Canada

A method for removing copper values from an anion exchange material loaded

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Metallizing Process U.S. Patent 5,605,565. Feb. 25, 1997 N. Feldstein, assignor to Surface Technology Inc., Trenton, N.J.

A plating bath for depositing on the sur- face of a body a codeposited free metal coating comprising a solution of metal ions to be plated and finely divided insoluble particulate matter wherein the insoluble particles are selected from the group con- sisting of PTFE, FEP, boron nitride, graph- ite, MO&, Talc, mica, WS,, AgS, WSe,, NbSe,, MoSe,, MoTe,, CaF,, FeS, and mixtures thereof.

Benzyl Alcohol Paint Stripper U.S. Patent 5,80.5,579. Feb. 25, 1997 J. Distaso, assignor to Elf Atochem Nofih America Inc., Philadelphia

A method of stripping paint comprising emulsifying an organic phase comprising benzyl alcohol and an emulsifying agent with

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118 METAL FINISHING . NOVEMBER 1997