coupled to the lift wheel to provide rotation about the central axis of rotation.

Blasting Apparatus U.S. Pafenf ~$520,572. May 28, 1996 A. E. Opel et al., assignors to Alpheus Cleaning Technologies Corp., Ranch0 Cucamonga, Calif.

An apparatus for producing and blasting sublimable carbon dioxide granules on demand.

Coated Abrasive U.S. Patent 5,520,711. May 28, 1996 H.J. Helmin, assignor to 3M Co., St. Pau/, Minn.

A method of making a coated abrasive article adapted to contact and abrade a work- piece, comprising providing a backing; pro- viding an abrasive surface comprising abra- sive particles and a binder, said binder adhering the abrasive particles to the back- ing; applying to at least a portion of the abrasive surface a grinding aid precursor composition; and subjecting the grinding aid precursor composition to conditions SUIT- cient to substantially cure the thermoset resin.

Powder Coating Apparatus U.S. Patent 5,520,735. May 26, 1996 DC. Mu/&r, assignor to Nordson Corp., West Lake, Ohio

A nozzle assembly and system for ap- plying powder to a workpiece.

Composite Plated Coating U.S. Patent 5,520,791. May 28, 1996 Y Murase, assignor to Yamaha Hafsudoki KK, Iwafa, Japan

A plating coating formed on a surface of a work, having a nonhomogeneous distri- bution of a dispersed substance, said distri- bution being changed at intervals or con- tinuously in the outward direction in which the plating coating is formed from a single electroplating liquid in such a way that the amount of the dispersed substance near the outer surface is at least 1.0% by weight greater than that near the surface of the work, wherein the amount of the dispersed substance near the surface of the work and near the outer surface of the plating coating are 0.2-45% by weight and 1.5-10% by weight, respectively.

Electrowinning of Lead U.S. Patent 5,520,794. May 28, 1996 M.D. Gernon, assignor to E/f Afochem North America Inc., Philadelphia

A process for the recovery of lead metal comprising electrowinning by utilizing an

inert anode and a lead receptive cathode in an aqueous solution of a lead salt of a C,-C, alkane sulfonic acid, and in the ab- sence of a redox couple in the aqueous solution.

Process for Recovering Etch Solutions U.S. Patent 5,520,814. May 28, 1996 A.M. Cc/i, assignor to In. Tee. lfalia international Environment Technology S.r./., Frosinone, /ta/y

A process for recovering spent copper etching solutions, comprising extracting copper ions with a liquid ion exchanger comprising oximes free of aromatic com- pounds so as to obtain a copper-loaded ion exchanger and a regenerated etching solu- tion; heating the liquid ion exchanger; washing the heated liquid ion exchanger with water and a small quantity of hydro- chloric acid so as to obtain a wash water; vaporizing the wash water thereby produc- ing a concentrate; crystallizing the concen- trate after vaporization; filtering the regen- erated etching solution; restoring the quality of the regenerated etching solution by the addition of gaseous ammonia; reex- tracting copper from the copper-loaded ion exchanger using sulfuric acid; washing the

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METAL FINISHING . FEBRUARY 1997 115

liquid ion exchanger with a washing water; neutralizing the washing water with lime so as to obtain a neutralized washing water; filtering the neutralized washing water; and recovering copper electrolytically.

Aqueous Spot Fillers U.S. Patent 5,520,955. May 28, 1996 0. Natvotka, assignor to Herberts G&H, Wuppetiaal, Germany

A process for repairing a defective coat- ing of a motor vehicle body, which com- prises applying the following aqueous spot filler to the defective portion of the body, said aqueous spot filler containing at least one water-dilutable, olefinically unsatur- ated binder, conventional pigments, fillers, and adjuvants, corresponding to a solids content of 50-90% by weight, lWO% of water, and O-10% of one or more organic solvents.

Coated Abrasive U.S. Patent 5,520,957. May 28, 1996 D. W Sange et a/, assignors to 3M Co., St. Paul, Minn.

A method of preparing a coated abrasive article containing a pressure-sensitive ad- hesive, comprising providing a coated

abrasive article having a backing bearing on one major surface thereof a layer of abrasive grains, said abrasive grains ad- hered to the backing by at least one binder, providing a pressure-sensitive adhesive comprising a water-emulsifiable, tacky ad- hesive formed from a copolymer of vinyl acetate and at least one terminally unsatur- ated vinyl monomer; coating the adhesive onto a major surface of the backing not bearing the layer of abrasive grains; smoothing the coated adhesive sufficiently to prevent formation of a pattern of ridges in the coating; and drying.

Surface Treatment for Tin-Plated Cans U.S. Patent $520,959. May 28, 1996 S. Tanaka et al, assignors to Heflkel Corp., Plymouth Meeting, Pa.

A method for treating at least the outer surface of a tin-plated, drawn, and ironed can wherein the precleaned surface to be treated is sprayed for at least 5 set at a temperature of at least 40°C with an aqeu- ous surface treatment liquid having a pH between 4 and 6 and comprising 0.03 to 0.3% by weight of acids selected from the group consisting of orthophosphoric acid

and condensed phosphoric acids and a con- centration of at least 0.1% of a water- soluble oligomer.

Plastisol-Based Coating U.S. Patent 5,520,961. May 28, 1996 L. Lysell and /_. Mahbom, assignors to Casco Nobel AB, Stockholm, Sweden

A method for spray coating a surface with a coating composition containing vinyl-chlo- ride-polymer-based plastisol and expandable thermoplastic microspheres, wherein the ex- pandable thermoplastic microspheres have a substantially halogen-free polymer shell, which comprises a copolymer of halogen- free monomers and, in an amount of from 85 to 97% by weight, &rile-containing mono- mers, and the coating composition is applied by airless spraying.

Paint Formulation U.S. Patent 5,520,963. May 28, 1996 TZ. Liu, assignor to DuPont Canada Inc., Mississauga, Canada

A method of spraying an article with urethane paint comprising adding cellulose acetate to the urethane paint; said cellulose acetate butyrate having a viscosity equal to or greater than 0.5 set and less than 20 set;

99% - Removal Efficiency or Greater I

Maximum Corrosion Resistance

Eliminates Orange- Brown

, Plume I

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