presenting the vessel to the spraying station in an inverted position following separation of the vessel from the conveyor; means for spraying the vessel positioned and arranged in the spraying station; means for rotating the vessel at a high rate of speed at the spraying station whereby a coating applied by the spraying means consists of a plurality of lay- ers; and means for re-contacting the coated vessel with the continuously operating con- veyor whereby the coated vessel is dis- charged from the spraying station.

Powder Coating Apparatus U..S.Pafent 5,518,546. May 21, 1996 BE. Williams et a/., assignors to Nexus Corp., Greenwich, Co/m.

An apparatus for coating a substrate with electrically charged resinous powder particles, which subsequently form on the substrate a uniform, continuous coating, comprising in combination an electrically insulating fluidized bed for inductively charging resinous powder particles; high voltage means disposd in one portion of the fluidized bed and connected to a variable high voltage power supply; grounded elec-

trode means disposed in another portion of the fluidized bed, whereby an electrical field is created between the high voltage and grounded electrode means to induc- tively charge the particles; fluidizing air means in communication with the fluidized bed for introducing air thereby establish- ing, in the presence of the resinous powder particles, an electrostatically charged pow- der cloud within the fluidized bed; convey- ing means connected to the fluidized bed for transporting electrically charged pow- der particles from the fluidized bed; and dispensing means affixed to the conveying means for directing the electrically charged particles onto the substrate.

Metal Treatment U.S. Patent 5,518,555. May 21, 1996 J. Ouyang and W.L. Harp/, assignors to 6efz Laboratories Inc., Trevose, Pa.

A method of coating a metal surface, which comprises contacting with a treatment solution comprising an essentially silicate, chromium, fluoride, and heavy metal free aqueous solution of an anionic polyacrylamide copolymer hav-

ing an acrylate to acrylamide ratio of 15 to 10:l,andapHof~11.

Paint Stripper U.S. Patent 5,518&V. May 21, 1996 NJ? Langford and D. W Erismann, assignors to 3M Co., St. Paul, Minn.

A paint stripper composition comprising a solvent mixture comprising benzyl alcohol or alkyl-substituted derivative thereof and me- thylene chloride or other chlorinated alkane with two or three carbon atoms and two or three chlorine atoms, wherein a ratio, in parts by weight, of the benzyl alcohol or alkyl- substituted derivative thereof to the methyl- ene chloride or other chlorinated alkane ranges from 3:l to 151.

Method for Selective Plating U.S. Patent 5,578,760. May 21, 1996 D. Ferrier and E. Yakobson, assignors to MacDermid Inc., Waterbuw Conn.

A process for the activation of metallic surfaces without the concurrent effective activation of plastic surfaces in proximity to the metallic surfaces, said process com-

??Rugged, fully electronic gages non- I destructively measure coatin on ferrous and non-ferrous meta P s

m Instant auto-calibration ??Comfortable, steady one-hand

??~$%%!o anyiown thkkness ??Improved low-range resolution

ana accuracy 8 New models for enodic

thick coatings, statistics or memory capability

??Measures non-magrtetic coatings m Ideal for measuring such as paint, enamel, plating, on small, hot or galvamzing, etc. on steel hard-tomach surfaces

??The industry standard for measuring non-magnetic coatings (paint,

QD

uMamu.a.A enamel, galvanizing, plating, etc.) on steel 1

H Stable design-no armoyin~rocking while measuring

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METAL FINISHING ?? FEBRUARY 1997 113

prising contacting with an activator solu- tion comprising an imidazole compound.

Methods for Pretreatment of Metals U.S. Patent 5318,770. May 21, 1996 A.E. Goliaszewski et al, assignors to Betz Laboratories Inc., Trevose, Pa.

A method for pretreating a metal surface in preparation for painting comprising ap- plying a hydrolysate selected from the group consisting of a zinc salt hydrolysate of a copolymer of maleic anhydride and vinyltriethoxysilane and a zirconium salt hydrolysate of a copolymer of maleic an- hydride and vinyltriethoxysilane.

Abrasive Article Incorporating a Filament U.S. Patent 5,516,794. May21, 1996 L.L. Sattw et al, assignors to 3M Co., St. Paul, Minfl.

An abrasive article comprising at least one composite abrasive filament, the composite abrasive filament comprising at least one pre- formed core at least partially coated with a hardened composition comprising a thermo- plastic elastomer having abrasive patticles dispersed and adhered therein, with the pro-

viso that if there is mom than one composite abrasive filament, the composite abrasive til- aments can be the same or different, wherein the at least one composite abrasive filament is mounted to a substrate.

Photosensitive Electrocoat U.S. Patent 5,518,859. May 21, 1996 N. lwasawa and J. Higashi, assignors to Kansai Painf Co. Lfd., Hyogo, Japan

A positive-type photosensitive elec- trodeposition coating composition and pro- cess for producing a circuit plate.

Vapor Degreasing Apparatus U.S. Patent 5,520,204. May 28, 1996 AK Bodis, assignor to Branson Ultrasonics Corp., Danbury, Corm.

In a vapor degreasmg apparatus for cleau- ing workpieces, comprising the combination of an enclosure housing a first chamber com- prising a boiling sump that includes a fmt heating means for raising the temperature. of a liquid solvent contained therein to its boil- ing point for providing solvent in its vapor state; a second chamber disposed in the en- closure and communicating with the first chamber for receiving the solvent in its vapor state in a vapor zone area, and including

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condensing means disposed in the vapor zone area for condensing the solvent; a third cham- ber disposed in the enclosure comprising an immersion sump disposed for receiving the liquid state solvent from the condensing means and including means for n%nrning liq- uid solvent overflow to the boiling sump, the improvement comprising a surface upon which the workpieces arc received and sec- ond heating means in heat transfer relation with the surface for heating the workpieces to a temperature above the boiling point tem- perature of the solvent.

Grit Recovery System U.S. Patent 5320,288. May 28, 19% J.C. Drenfer et al, assignors fo PCT Inc., Davenpod, lowa

An apparatus for the separation and re- covery of abrasive grit material from blast- ing material containing waste material and abrasive grit material, comprising a cham- ber having a blasting material inlet; a me- chanical separator coupled to the blasting material inlet for separating the waste ma- terial from the abrasive grit material; a cylindrical lift wheel rotatably mounted within the chamber having a plurality of paddles affixed thereon; and a drive motor

Metal Finishing Questions? People Have Been

Calling Potters Since 1914 For over 80 years,

whenever a question comes up regarding

metal finishing, Potters usually receives the call.

Even today, Potters has an “answerman” standing by with

the benefits of years of research and advice for most questions.

Whether or not you are a current customer, or are using a different

process, Potters invites you to call their answerman. With all the years

of experience, the knowledgeable professionals at Potters are interested

in comparing and sharing their valuable technical expertise. e Become part of the

solution. Just pick up the phone and ask for

Ron Schmidt.. . the Answerman.

Call the Potters Answerman anytime, no strings attached.

2Ol-438-6462

Southpoint Corporate Headquaners P.O. Box 840 Valley Forge, PA 19482 Potters Technology Center 600 Industrial Rd. Carlstadt, N.J. 07072

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114 METAL FINISHING ?? FEBRUARY 1997