contacting with a porous membrane anioni- tally functionalized surface selective to the separation of monovalent anions from poly- valent anions to provide permeate and residual streams.

Centrifugal Disk Finishing Apparatus U.S. Patent 5,279,074. Jan. 18, 1994 R.S. Davidson, assignor to The Grav-l-F/o Cop, Sturgis, Mich.

A centrifugal disk finishing apparatus for using dry media comprising ground cob meal, wood, and the like coated with abrasive.

Polyester-Acrylic Powder Coatings U.S. Patent5,280,089. Jan. 18, 1994 H.J. DeGraaf and S.M. Sobek, assignors to Ferro Corp., Cleveland

A thermosetting powder paint coating composition containing a polymeric binder, the polymeric binder comprising on a weight basis between 55-95% of a polyes- ter-graft-acrylic copolymer and between S-45% of a low molecular weight crystal- line polyester.

Zinc-Plated Metallic Material U.S. Patent5,283,131. Feb. 1, 1994 K. Mori and S. Nomura, assignors to Nihon Parkerizing Co. Ltd., Tokyo

A zinc-plated metallic material compris- ing a metallic material; a plating layer consisting of zinc or zinc alloy containing 70% by weight or more of zinc; a coating layer on the plating layer comprising at least one of magnesium oxide or hydrated magnesium oxide in an amount from 10-500 mg per square meter of the coating layer and also at least one of chromium oxide or chromium hydrated oxide in an amount of from 10-500 mg of chromium per square meter.

High-Speed Tin Plating U.S. Patent5,282,954. Feb. 1, 1994 W. Opaskar, assignor to Atotech USA Inc., Somerset N. J.

In the method for continuous electrode- position of a tin coating on a basis metal in an electroplating cell from a solution containing tin methane sulfonate and free methane sulfonic acid under conditions of high current density and high strip speed,

the improvement, which consists of an alkoxylated diamine nonionic surfactant.

Rotary Peening Apparatus U.S. Patent 5,284,039. Feb. 8, 1994 0. R. Togerson, assignor to Minnesota Mining and Manufacturing Co., St. Paul, Minn.

A spacer ring for a rotary peening apparatus including a hub having a gener- ally cylindrical peripheral surface compris- ing means for releasably retaining a retain- ing end of each of a plurality of peening flaps, the peripheral surface bounded by opposed hub ends, the spacer comprising a base member, and a series of circumferen- tially spaced pin members.

Magnetron Sputtering Cathode U.S. Patent5,284,564. Feb. 8, 1994 W Maass, assignor to Leybold AG, Hanau, Germany

A magnetron sputtering cathode for a vacuum coating apparatus with a circular target plate made of the material to be sputtered, with a plurality of magnet ar- rangements disposed in back of the target plate and comprising at least a first magnet arrangement including a continuous row of

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