*a& ‘?& .(” ,$k.? r.. p ,” ; . ” , ‘.W z*;+>,, ,’ ;,,. ,

g#fj@$j;$; -‘:,-‘:i, ‘: . : ..

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.

ELECTROSTATIC SPRAY GUN

U.S. Patent 5,957,396. Sept. 28, 1999 G.W. Crum et al., assignors to Nordson Corp., Westlake, Ohio

A mounting assembly for a spray gun with anti-back-ionization probe.

BLASTING APPARATUS

U.S. Patent 5,957,761. Sept. 28, 1999 R.E. Miller et al., assignors to Northrop Grumman Corp., Los Angeles

A closed circuit media capture and recovery head for a portable wheat starch media blast system.

ANODIZING PROCESS

U.S. Patent 5,958,206. Sept. 28, 1999 H. Rothbauer and E. Renner, assignors to ITT Manufacturing Enterprises Inc., Wilmington, Del.

A method for producing an oxide coating on a metal surface of a workpiece, which comprises pro- viding a cathode in an anodizing electrolytic bath; providing a workpiece, as an anode, in the an- odizing electrolytic bath; provid- ing at least one auxiliary anode in the anodizing electrolytic bath in a vacinity of a portion of the work- piece where the oxide coating is undesirable; attaching the auxil- iary anode to a cover that is elec- trically passive in the electrolytic bath and placing the cover on the workpiece, whereby a portion of the workpiece is closed by the cover, but the auxiliary anode is not in contact with the workpiece; subjecting the workpiece and cathode to a first direct current source; and preventing formation of the oxide coating in a portion of the workpiece by subjecting the

auxiliary anode to the first direct current source or to a second di- rect current source.

PROCESS FOR APPLYING A

SURFACE COATING

U.S. Patent 5,958,207. Sept. 28, 1999 K. Mull, assignor to Heidelberger Druckmaschinen AG, Heidelberg, Germany, and Winterthurer Metallveredelung AG, Winterthur, Switzerland

An improved process for electro- chemically depositing a surface coating, wherein a component is subjected to a galvanic bath and the surface coating is deposited on the component with a structured outer surface topography, by forming a plurality of island for- mations of deposition material on a surface of the component by pro- viding an electrical waveform as a source of electrical energy and causing a growth of the deposition material on the plurality of island formations for forming the struc- tured outer surface topography with a follow-up waveform as the source of electrical energy during a growth working period.

ELECTRODEPOSITED COPPER FOIL

U.S. Patent 5,958,209. Sept. 28, 1999 H.Sakai et al., assignors to Mitsui Mining & Smelting Co., Ltd., Ageo, Japan

A process of electrodepositing cop- per foil having a matte side roughness Rz of 2.5 km or less and atomic cells with a (111) ori- entation as measured by X-ray diffraction from a copper solution containing copper ions, 0.01 to 0.10 g/L of a polyether glycol, 0.5 to 1.0 g/L of tin ions, 0.5 to 5.0 g/L

of iron ions, and less than 0.1 mg/L chloride ion at a current density of about 30 to 100 A/dm2.

ELECTROWINNING OF ZINC

U.S. Patent 5,958,210. Sept. 28, 1999 S.C. Siu and J.W. Evans, assignors to The Regents of the University of California, Oakland, Calif

A method for electrowinning me- tallic zinc from zinc ion to aque- ous solution comprising perform- ing electrolysis on a mixture of solid conductive particles and aqueous alkali solution ranging in concentration from 3 N to about 20 N alkali and containing dis- solved zinc ion at an initial con- centration ranging from 50 to 500 grams of zinc ion per liter of solu- tion, in an electrolytic cell con- taining first and second vertically arranged, parallel flat plates.

PROCESS FOR TREATING BRASS

U.S. Patent 5,958,257. Sept. 28, 1999 M. W. Regelbrugge et al., assignors to Gerber Plumbing Fixtures Corp., Chicago

A process for the treatment of brass components to reduce leach- ing lead therefrom when the com- ponent is exposed to water com- prising contacting the brass component with an aqueous caus- tic solution wherein the caustic solution is selected from the group consisting of sodium hydroxide and potassium hydroxide and has a pH above 10 to remove some of the leachable lead from the brass component; rinsing to remove ex- cess caustic solution; and contact- ing with a water-soluble carboxy- lit acid to remove substantially all of the remaining leachable lead.

104 Metal Finishing