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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. 20231. DOUBLE METALLIC RESIST PRINTED CIRCUIT BOARDS U.S. Patent 5,980,721. Nov. 9, 1999 O. Prevotat and J.A. Lhermitte, assignors to Thomson-CSF, Paris, France In a method to fabricate a printed circuit having a surface plated with a base metal layer, the im- provement comprising depositing a first metallic resist on the base metal layer to delimit at least pat- terns of circuit elements to be etched in a layer having a first thickness; forming metallized holes in the plated surface after depositing the first metallic re- sist; and depositing a second me- tallic resist after forming the met- allized holes to delimit at least patterns of circuit elements to be etched in a layer having a second thickness greater than the first thickness; whereby more accurate etching in the layer having the first thickness compared to etch- ing in said layer having said sec- ond thickness is possible. PLATED ALUMINUM ALLOY CYLINDER BLOCK U.S. Patent 5,980,722. Nov. 9, 1999 T. Kuroda et ai., assignors to Suzuki Motor Corp., Shizuoka-ken, Japan A pretreatment method for plat- ing an aluminum alloy, which comprises the step of carrying out anodic electrolytic etching of a sil- icon-containing aluminum alloy to protrude silicon from a surface of the aluminum alloy, wherein the anodic electrolytic etching is carried out by using the silicon- containing aluminum alloy as an anode. November 2000 UPGRADING WASTE SHEET METAL U.S. Patent 5,980,725. Nov. 9, 1999 B. Campenon and J. Creefkes, assignors to Compagnie Europeenne de Dezingage, Saint SAulve, France. A method for upgrading waste material comprising sheet metal coated with a zinc plating on at least one side thereof, comprising mechanically processing by crush- ing and creating cracks in zinc plating; chemically etching to dis- solve the zinc by immersion in a basic bath; and separating the chemically etched waste material from which zinc has been dis- solved from the bath having zinc dissolved therein. APPARATUS FOR REGENERAnNG AN ETCH SOLUTION U.S. Patent 5,980,771. Nov. 9, 1999 R. Cowan, assignor to Aerochem Inc., Orange, Calif A method for regenerating, within a reactor vessel, a spent Type II etchant solution of the character produced during chemical milling of aluminum and aluminum alloy parts, which have been sub- mersed into a Type II etchant so- lution contained within a chemi- cal milling tank to form a regenerated etchant solution com- prising cooling the spent etchant solution; adding water to form an ambient temperature, diluted etchant solution; filtering; trans- ferring to a reactor vessel; and adding alumina trihydrate to form a mixed solution and to cause a reaction to form regener- ated etchant solution and alu- mina. COLOR-PLUS-CLEAR COMPOSITE COATING U.S. Patent 5,980,993. Nov. 9, 1999 C. W. Mauer et al., assignors to PPC Industries Ohio Inc., Cleveland A method of applying a color-plus- clear composite coating to a sub- strate, which comprises applying to the substrate a colored film- forming composition to form a transparent topcoat wherein the clear film-forming composition comprises 65 to 85% by weight of a hydroxyl-functional acrylic poly- mer and 15 to 35% of an amin- oplast cross-linking agent. ROTARY ATOMIZER U.S. Patent 5,980,994. Nov. 9, 1999 K. Honma and 1. Yamasaki, assignors to Toyota Jidosha KK, Toyota, Japan An electrostatic coating method using an apparatus comprising a housing; an atomizing head for electrostatically charging paint particles; an air motor; and an air cap disposed on the front side of the housing. ONE·PACKAGE POLYURETHANE TOPCOAT U.S. Patent 5,981,074. Nov. 9, 1999 K.J. Wu and F. Lee, assignors to Cytec Technology Corp., Wilmington, Del. A coated substrate comprising a first acid-cured layer derived from an acid-curable coating composi- tion containing an acidic compo- nent as acid catalyst; and a cured polyurethane adjacent layer de- rived from a one-package polyure- thane coating composition of a blocked polyisocyanate, an isocya- 95
