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.

TEMPORARY PROTECTIVE COATING U.S. Patent 6,187,849. Feb. 13, 2001 R.M. Nugent, Jr., et al., assignors to PPG Zndustries Ohio Inc., Cleveland

A coating composition, which when deposited and dried on a metallic substrate is removable by contacting with an aqueous al- kaline cleaning solution, said coating composition comprising a wax present in an amount up to 20%; a base-neutralized, acid- functional polymer; and an amine containing an acyclic moiety.

LOW TEMPERATURE CURABLE POWDER COATING U.S. Patent 6,187,875. Feb. 13, 2001 A.E.G.C. Bergmans et al., assignors to Shell Oil Co., Houston

A powder coating composition curable at a temperature of at least 120°C comprising an epoxy resin and a linear carboxylic acid- functional polyester resin.

ROTARY ATOMIZER U.S. Patent 6,189,804. Feb. 20, 2001 K. Vetter et al., assignors to Behr Systems Inc., Auburn Hills, Mich.

A rotary atomizer bell cup for at- omizing particulate material in- cluding paint having a generally conical overflow surface between a radially inward central axial opening and a radially outward atomizing edge, the generally con- ical overflow surface having a generally constant flow angle rel- ative to the atomizing edge and a deflector having a deflection sur- face of generally rotational sym- metry disposed in front of the cen- tral opening having a generally constant angle relative to the axis

from at least one inlet to a radial outer edge.

DEVICE FOR VACUUM METALLIZING U.S. Patent 6,189,806. Feb. 20, 2001 G. Klemm et al., assignors to Leybold Systems GmbH, Hanau, Germany

A device for a vacuum-metallizing arrangement comprising a vapor- izer, including a vaporizer hous- ing that defines a pot for contain- ing introduced metal to be vaporized and a nozzle element with a gap to allow produced metal vapor to exit.

MULTIFEED SPRAY GUN U.S. Patent 6,189,809. Feb. 20, 2001 G. Schwebemeyer, assignor to Zllinois Tool Works Inc., Glenuiew, 111.

A paint spray gun comprising a nozzle; a passageway for receiving compressed air and directing com- pressed air to the nozzle; chamber means for receiving paint to be directed to the nozzle, said cham- ber means including an upper passageway for receiving gravity- fed paint and a lower passageway for receiving pressure- or suction- fed paint.

APPARATUS FOR RECLAIMING USED ABRASIVES U.S. Patent 6,190,235. Feb. 20, 2001 J.S. Csabai and J.J. Csabai, Baie d’l_Jrfe(&&acute), Can.

A method for reclaiming used abrasives, which comprises form- ing a turbulent levitating fluid- ized bed of the used abrasives in a substantially horizontal elon- gated enclosure having a charging

end, a discharging end, and a po- rous bottom, in which enclosure the fluidized used abrasives are made to move from the charging end to the discharging end, said turbulent levitating fluidized bed being formed by blowing fluidiz- ing air through the porous bottom of the enclosure so as to produce vigorous agitation or scrubbing action adapted to liberate adher- ing contaminants from the used abrasives.

CHROMATING SOLUTION U.S. Patent 6,190,464. Feb. 20, 2001 Y. Uchida et al., assignors to Nisshin Steel Co. Ltd., Tokyo

A chromating solution comprising a water-soluble chromium com- pound and as a reducing agent only an oxycarboxylic acid com- pound selected from the group consisting of tartaric acid, mal- onic acid, citric acid, lactic acid, glycolic acid, glyceric acid, tropic acid, benzilic acid, and hydroxy- valeric acid and in which hexava- lent chromium ions produced by dissolution of the water-soluble chromium compound have been reduced with the oxycarboxylic acid compound to trivalent chro- mium ions to 0.1 or less as the ratio of CR’+/total chromium ions, and the total chromium ions are in a concentration of from 1 to 40 g/L.

SPUTTERING DEVICE U.S. Patent 6,190,513. Feb. 20, 2001 J.C. Forster et al., assignors to Applied Materials Inc., Santa Clara, Calif:

A darkspace shield for improved RF transmission in inductively

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