shield plate in the plating bath compartment; a cylinder in oper- ative communication with the an- ode; and a slit in the second wall placed to allow the planar article to exit from the plating bath com- partment.

ACID-FREE CATALYST PASTE FOR CATHOOIC COATING U.S. Patent 6,174,422. Jan. 16, 2001 H. H~nig, et al., assignors to Herberts GmbH, Wuppertal, Germany

An acid-free, aqueous ca ta lys t paste with a solids content of 30 to 70% by weight and containing di- alkyltin oxide and a water-thin- nable cationic binder vehicle, ob- ta ined by dispersing dialkylt in oxide in an acid-free aqueous dis- persion or solution of one or more hydroxycarboxylic acid salts of bismuth(III) in a weight ratio of tin to bismuth, calculated as the metal, from 1:3 to 3:1, and commi- nuting the preparation obtained with one or more cationic binder vehicles.

ELECTIBOCOATING A VEHICLE BODY U.S. Patent 6,174,42~. Jan. 16, 2001 C.A. Wood and R.G. Hooper, assignors to Acco Systems Inc., Warren, Mich.

A method of electrocoating a vehi- cle body comprising conveying a vehicle body over an electrocoat- ing dip tank containing electro- coat ing solut ions, said vehicle body having a longitudinal axis, a forward end and a rearward end; angling the vehicle body longitu- dinal axis relative to horizontal; lowering the vehicle body verti- cally into the electrostat ic dip t a n k and immers ing; a l te rna- tively rocking the forward and rearward ends of the vehicle body upwardly and downwardly about a lateral axis generally perpendic- ular to the longitudinal axis of the vehicle angling the vehicle body longitudinal axis relative to hori-

zontal and ra is ing the vehicle body out of the dip tank; and con- veying the vehicle body to a sec- ond station.

PLATING PROCESS U.S. Patent 6,174,425. Jan. 16, 2001 C.R. Simpson et al., assignors to Motorola Inc., Schaumburg, Ill.

A process for depositing a layer of material over a substra te com- prising placing the substrate into a plating system including a first electrode; a second electrode elec- t r ical ly connected to the sub- strate, wherein the second elec- trode includes clamp portions and electrical current density modifier portions; each of the electrical current density modifier portions lies closer to the first electrode compared to its corresponding clamp portion; and an ionic liquid, wherein the ionic liquid contacts the first electrode, the second electrode, and the substrate; bias- ing the first electrode to a first potential and the second electrode to a second potential to deposit the layer of material on the sub-

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strate, wherein the first potential is different from the second poten- tial; and removing the substrate from the plating system.

REMOVAL OF POLLUTANTS FROM EFFLUENTS U.S. Patent 6,174,444. Jan. 16, 2001 J.J. Smit, Potchefstroom Industrial, South Africa

A m e t h o d of c o n t i n u o u s flow t rea tment of an effluent contain- ing phosphate and sulfate con- taminants, which comprises con- t inuously introducing, at a flow rate, the effluent as an electrolyte into an electrolyte reactor, which comprises at least one sacrificial zinc anode and at least one cath- ode; dissolving metallic cations at a controlled rate from the anode to increase the pH of the effluent and allow formation of an insolu- ble zinc con taminan t complex; balancing the flow rate of the ef- fluent and electrical energy to control the pH at a level of 2 to 7 in order to maximize and promote the formation of the zinc contam-

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September 2001 117