Granted in theMetal Finishing FieldPrinted 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.

DOUBLE METALLIC RESISTPRINTED CIRCUIT BOARDSU.S. Patent 5,980,721. Nov. 9, 1999O. Prevotat and J.A. Lhermitte,assignors to Thomson-CSF, Paris,FranceIn a method to fabricate a printedcircuit having a surface platedwith a base metal layer, the im­provement comprising depositinga first metallic resist on the basemetal layer to delimit at least pat­terns of circuit elements to beetched in a layer having a firstthickness; forming metallizedholes in the plated surface afterdepositing the first metallic re­sist; and depositing a second me­tallic resist after forming the met­allized holes to delimit at leastpatterns of circuit elements to beetched in a layer having a secondthickness greater than the firstthickness; whereby more accurateetching in the layer having thefirst thickness compared to etch­ing in said layer having said sec­ond thickness is possible.

PLATED ALUMINUM ALLOYCYLINDER BLOCKU.S. Patent 5,980,722. Nov. 9, 1999T. Kuroda et ai., assignors to SuzukiMotor Corp., Shizuoka-ken, Japan

A pretreatment method for plat­ing an aluminum alloy, whichcomprises the step of carrying outanodic electrolytic etching of a sil­icon-containing aluminum alloyto protrude silicon from a surfaceof the aluminum alloy, whereinthe anodic electrolytic etching iscarried out by using the silicon­containing aluminum alloy as ananode.

November 2000

UPGRADING WASTE SHEET METALU.S. Patent 5,980,725. Nov. 9, 1999B. Campenon and J. Creefkes,assignors to Compagnie Europeennede Dezingage, Saint SAulve, France.

A method for upgrading wastematerial comprising sheet metalcoated with a zinc plating on atleast one side thereof, comprisingmechanically processing by crush­ing and creating cracks in zincplating; chemically etching to dis­solve the zinc by immersion in abasic bath; and separating thechemically etched waste materialfrom which zinc has been dis­solved from the bath having zincdissolved therein.

APPARATUS FOR REGENERAnNGAN ETCH SOLUTIONU.S. Patent 5,980,771. Nov. 9, 1999R. Cowan, assignor to AerochemInc., Orange, Calif

A method for regenerating, withina reactor vessel, a spent Type IIetchant solution of the characterproduced during chemical millingof aluminum and aluminum alloyparts, which have been sub­mersed into a Type II etchant so­lution contained within a chemi­cal milling tank to form aregenerated etchant solution com­prising cooling the spent etchantsolution; adding water to form anambient temperature, dilutedetchant solution; filtering; trans­ferring to a reactor vessel; andadding alumina trihydrate toform a mixed solution and tocause a reaction to form regener­ated etchant solution and alu­mina.

COLOR-PLUS-CLEAR COMPOSITECOATINGU.S. Patent 5,980,993. Nov. 9, 1999C. W. Mauer et al., assignors to PPCIndustries Ohio Inc., Cleveland

A method of applying a color-plus­clear composite coating to a sub­strate, which comprises applyingto the substrate a colored film­forming composition to form atransparent topcoat wherein theclear film-forming compositioncomprises 65 to 85% by weight ofa hydroxyl-functional acrylic poly­mer and 15 to 35% of an amin­oplast cross-linking agent.

ROTARY ATOMIZERU.S. Patent 5,980,994. Nov. 9, 1999K. Honma and 1. Yamasaki,assignors to Toyota Jidosha KK,Toyota, Japan

An electrostatic coating methodusing an apparatus comprising ahousing; an atomizing head forelectrostatically charging paintparticles; an air motor; and an aircap disposed on the front side ofthe housing.

ONE·PACKAGE POLYURETHANETOPCOATU.S. Patent 5,981,074. Nov. 9, 1999K.J. Wu and F. Lee, assignors toCytec Technology Corp., Wilmington,Del.

A coated substrate comprising afirst acid-cured layer derived froman acid-curable coating composi­tion containing an acidic compo­nent as acid catalyst; and a curedpolyurethane adjacent layer de­rived from a one-package polyure­thane coating composition of ablocked polyisocyanate, an isocya-

95

·.~ ) .. >,-.~ ."

nate-reactive material, and animino-functional amino resin.

MULDLAYERED PAINT WITHNONAQUEOUS TOPCOATU.S. Patent 5,981,080. Nov. 9, 1999U. Rockrath and H. Baumgart,assignors to BASF Coatings AG,Muenster-Hiltrup, Germany

A multicoat paint system com­prising a polymer film of abasecoat applied to a substratesurface, and a nonaqueous top­coat applied to the polymer film,the nonaqueous topcoat compris­ing a hydroxy-functional polyac­rylate resin comprising secondaryOR groups, a cross-linking agentcomprising tris(alkoxycarbon­ylamino-)triazine, and optionallyfurther cross-linking agents.

ELECTROLYnC CLEANING PROCESSU.S. Patent 5,981,084. Nov. 9, 1999V.M. Riabkov and V.L. Steblianko,assignors to Metal Technology Inc.,Mandeville, La.

An electrolytic process for clean­ing the surface of a workpiece ofan electrically conducting mate­rial, which comprises providingan electrolytic cell with a cathodecomprising the surface of theworkpiece and an inert anode; in­troducing an electrolyte into thezone created between the anodeand the cathode by causing it toflow under pressure through oneor more holes, channels, or aper­tures in the anode and therebyimpinge on the surface of thecathode, the surface of the cath­ode not otherwise being immersed

in the electrolyte; and applying avoltage and operating in a regimein which the electrical current de­creases or remains substantiallyconstant with increase in the volt­age applied between the anodeand the cathode, and in a regimein which discrete gas bubbles arepresent on the surface of theworkpiece during treatment.

ENAMEL PAINTU.S. Patent 5,981,652. Nov. 9, 1999K. Kawazu et al., assignors to ToyotaJidoska KK, Aichi, and Nippon BeeChemical Co., Ltd., Osaka, both ofJapan

A one-liquid low-temperaturehardenable-type colored enamelpaint comprising a polyester­polyol and an acrylic polyol; a

Lutz FlowControl System

Having problems with the authorities? (EPA or OSHA)SUpplying chemicals and having difficulties to convince yourCustomer gaJIons delivered? Not knowing exactly how muchchemicals left in your Drum or how much you transferred?

Lutz can help you to measure the flow, set you up with abatching-system out of your Drum, even offer you amix!pumpA)atch system.

ION EXCHANGE RESINSCHELATION & STANDARDfor METALS REMOVAL in

• RINSE WATER RECYCLE• METALS SCAVENGING

• WATER DEMINERALIZATION

• TRACE METALS POLISHING• BATH PURIFICATION

• WASTE WATER TREATMENT

• PRECIOUS METALS RECOVERY

• ION SPECIFIC RESINS

ALL FROM

phone: 800·343·1500fax: 610·668·8139

hllp/ftwww.purolitl.com

Phone: (770) 925-1222(800) 843-3901(770) 923-0334

At Lutz we set the Standard InDrUm and Container Pumps.Please contact us for more Information and your localDlstrlbutorlService center:

1.IIz ............1160 Beaver Ruin RoadNorcross. GA 30093-4898 Fax:

E-mail: lutzpumps@mindspring.com·Website:lutzpumps.comCircle 085 on reader information card Circle 055 on reader information card

96 Metal Finishing