Regenerating Sulfate Electrolyte in Electrogalvanizing U.S. Patent 5,690,804. Nov. 25, 1997 J. Kuhlrnann and U. Gl~sker, assignors to SMS Schloemann-Siernag AG, Dusseldorf, Germany

A method of regenerating zinc sulfate electrolyte in a steel strip electrogalvaniz- ing process by precipitating dissolved iron from electrolyte circulating through a coat- ing cell, the method comprising removing a partial quantity of circulating electrolyte to be regenerated; oxidizing to Fe 3÷ the iron dissolved in the electrolyte by a redox- controlled addition of oxidizing agent; re- cipitating as sludge any Fe 3÷ still dissolved in the electrolyte by a controlled addition of a ZnO/water suspension or a ZnCO3/ water suspension to raise the pH value to about 2.9 to 3.5; dissolving excess ZnO or ZnCO 3 by adding fresh electrolyte; and filtering the precipitated Fe 3+ from the electrolyte and returning the regenerated partial quantity back into the circulating electrolyte.

Direct Metallization Process U.S. Patent 5,690,805. Nov. 25, 1997

C.E. Thorn et aL, assignors to Electrochemicals Inc., Maple Plain, Minn.

A method of applying a conductive graphite coating to a nonconductive layer comprising providing a board comprising at least first and second electrically con- ductive metal layers separated by a non- conductive layer; providing a liquid disper- sion comprising electrically conductive synthetic graphite having a mean particle size no greater than 50 microns to provide an electrically conductive coating; apply- ing to form a substantially continuous, electrically conductive, graphite coating thereon, wherein the graphite coating has an electrical resistivity of less than 1,000 ohms.

Electrolytic Recovery U.S. Patent 5,690,806. Nov. 25, 1997 J.G Sunderland and LM. Dalrymple, assignors to EA Technology Ltd., United Kingdom

A method of removing at least one metal from a dilute solution, which comprises passing a dilute solution of the metal through an electrolytic cell comprising a

porous tubular support provided with a cathode comprising a porous carbon fiber material.

Spray Booth for Powder Coating U.S. Patent 5,690,995. Nov. 25, 1997 G. Fischli et al., assignors to Gema Volstatic AG, St. Gallen, Switzerland

A method of spray coating articles with powder from a spray booth with a floor including an outer collection means ar- ranged around the perimeter and along the side wall to collect and remove surplus powder dropped onto the floor.

Patination Agent for Copper U.S. Patent 5,691,001. Nov. 25, 1997 M.S. Ainali et al., assignors to Outokurnpu Cooper Oy, Espoo, Finland

A method for surface treatment of an object of a copper bearing material com- prising forming a precipitate by mixing an aqueous soluton of at least one copper salt and an aqueous solution of an alkali metal

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