New Developments in the Metal Finishing Field C o m p i l e d b y A n s e l m K u h n , M e t a l F i n i s h i n g I n f o r m a t i o n S e r v i c e s L t d .

R e c e n t l y p u b l i s h e d patents

M e t h o d and Dev ice for Local ly Remov ing Coat ing f rom Parts US .2004244910 Albrecht, A.; Eberlein, A., et al. Method and device for locally stripping coatings from compo- nents, an absorbent medium being provided, the medium being sup- plied with a coating removal liq- uid, and the medium containing the coating removal liquid being brought into contact with the area of the component from which the coating is to be removed.

Treat ing So lu t ion for Sur face Trea tment of M e t a l and Surface Treatment M e t h o d U.S. 2004244874 Nakayama, T.; Sato, H., et al. Conversion coating for iron, steel, zinc, and mixed metals of these including one or more of titanium, hafnium, zirconium, silicon, fluo-

fine. Compounds containing other named metals can be added.

Electro ly t ic Process for Depos i t ing a Layer of Copper on a S tee l Wire U.S. 2004247865 Pavan, F. Electrolytic process for depositing copper on a steel wire in which the wire travels through an acidic elec- trolytic bath of an aqueous solution of Cu (II) ions in the form of a salt of an acid. A direct electric current passes through the solution between at least one anode and the wire acting as the cathode. The bath also has from 1.9 to 6 mM/1 of a thiourea and from 1.9 to 6 raM/1 of an amino acid.

Electro lyt ic Process ing Appara tus and M e t h o d U.S. 2004256237 Kobata, I.; Shirakashi, M., et al. Electrolytic processing apparatus and method which, while omitting

a CMP t rea tment entirely or reducing a load upon a CMP t r ea tmen t to the least possible extent, can process a conductive material formed in the surface of a substrate to flatten (planarize) the material , or can remove (clean) extraneous mat ter adher- ing to the surface of a workpiece such as a subst ra te . The elec- trolytic processing appara tus includes a pair of electrodes dis- posed at a given distance, an ion exchange membrane disposed be tween the pair of electrodes, and a liquid supply section for supplying a liquid be tween the pair of electrodes. The electrolyt- ic processing method includes providing an electrode section having a pair of electrodes dis- posed at a given distance with an ion exchanger being interposed; and bringing the electrode into contact with or close to a work- piece while supplying a fluid to the ion exchanger, thereby pro-

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cessing the surface of the work- piece.

D e v i c e f o r t h e E l e c t r o d e p o s i t i o n o f A l u m i n u m or A l u m i n u m A l l o y s f r o m O r g a n o m e t a l l i c E l e c t r o l y t e s C o n t a i n i n g A l k y l a m m o n i u m C o m p l e x e s U.S. 200425619 Heller.; Vries, Hans De Aprotic media with alkylaluminium complexes, configured for barrel plating, operating at up to 110°C.

Plating Device U.S. 2004262150 Toshikazu, Y.; Takashi, T, et al. Vertical plating of printed circuit boards and similar where a so- called regulation plate is perforat- ed sheet interposed between anode and cathode surface to improve current distribution and allow

improved plating into printed cir- cuit board through holes.

P o w d e r C o a t i n g D e v i c e a n d M e t h o d U.S. 2004255865 Morita, T; Mural, H., et al. Powder coating apparatus where pulse signal $2 of a low voltage generated by a pulse signal gener- ation circuit is boosted to a high voltage by means of a high voltage impression circuit, so that it is impressed upon corona electrodes. As a result, a corona discharge is intermittently generated from the corona electrodes toward an object to be coated, whereby powder coat- ing material sprayed from a nozzle opening of a gun main body in a forward direction is charged with negative ions developed by the corona discharge, whereafter it is

directed toward the object to be coated, and is deposited on a sur- face of the object.

Vacuum Carbo-Nitriding Method U.S. 2004250921 Yamaguchi, K. Multi-stage process including preheat, carburization, diffusion, and nitriding.

Reader queries relating to patents published in

Metal Finishing, or to advise on patent searches

of the approximately 30 million patents in the

public domain, can be e-mailed to Anselm Kuhn,

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rized are a sampling of some 500 surface-finish-

ing-related patents published every month.

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