Metal Substrate with Improved Paint Adhesion U.S. Patent 5,498,481. Mar. 12, 1996 WJ. van Ooij, assignor to Arrnco Inc., Middletown, Ohio

A metal having a corrosion-resistant coating, comprising a crosslinked layer coupled to a metal substrate, said crosslinked layer being the reaction prod- uct formed by curing a powder, said pow- der being a blended mixture of a thermo- setting resin and a solid, nonhydrolyzed organosilane from the group consisting of monomeric, dimeric, or oligomeric mole- cules, said organosilane including one or- ganufunctional group and one silicon con- taining group consisting of trialkoxysilyl or trichlorosilane, said organosilane being a solid at ambient temperature and having a melting point no greater than the curing temperature of said resin, said crosslinked layer being coupled to the substrate by the orgsnosilane.

Powder Coating Composition U.S. Patent 5,498,783. Mar. 12, 1996 R.J. Foukes and C.A. Sfanfs, assignors to BASF Corp., Southfield, Mich.

A thermosetting powder coating compo- sition resistant to overspray incompatibility defects, comprising solid particulates of a uniform mixture of a polyester resin having an average of two or more carboxyl groups; a first crosslinker, reactive toward the car- boxy1 groups of the polyester resin, se- lected from the group consisting of epoxy- functional compounds, polyoxazolines, and polydioxanes; 1 to 20% of an acrylic co- polymer having reactive functionality se- lected from the group consisting of hy- droxyl functionality, isocyanate functionality, epoxy functionality, and amine functionality; and a second crosslinker that is reactive toward the reac- tive functionality of the acrylic copolymer; wherein the acrylic copolymer has a weight average molecular weight of from 10,000 to 40,000.

Thickness Tester U.S. Patent 5,498,957. Mar. 12, 1996 H. Fischer, Sindelfingen, Germany

An appliance for the coulometric mea- surement of the thickness of metallic coat- ings, comprising a measuring probe, a re- versing pump device, and a support device for mounting a measurement object.

Manufacturing Printed Circuit Boards U.S. Patent 5,499,446. Mar. 19, 1996 T Murakami, assignor to NEC Corp., Tokyo

A method for manufacturing a printed circuit board, comprising forming a plural- ity of penetrating holes at predetermined locations along a straight line on a laminate board whose two surfaces are copper plat- ed; forming a plurality of semicircular grooves by cutting the penetrating holes into halves by a slit forming process; and forming a plurality of semicircular throughholes by using a jig member in-

Circle 118 on reader information card

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METAL FINISHING . NOVEMBER 1996 129

serted into the slit and forming a copper- plated layer on a surface of each of the semicircular grooves.

Device for Shot Blasting U.S. Patent 5,499,519. Mar. 19, 1996 R.G. Brunier et al., assignors to Sociefe Nationale dFfude ef de Consfrucfion de Mofeures d’hiafion “SNECMA”, Paris

A shot projection apparatus for shot blasting under pressure surfaces inaccessi- ble by a straight pipe and requiring the shot to change direction to shot blast the sur- faces.

Electrostatic Spraying Machine U.S. Patent 5500,045. Mar. 19, 1996 P Ehinger and F! Gory assignors to Sames S.A., Meylan, France

An electrostatic spraying machine in- cluding a gantry for coating objects, com- prising a horizontal beam consisting of electrical insulating material extending above a path of travel for the objects, said beam being hollow; and at least one coat-

ing product sprayer connected to receive coating product conveyed along the beam.

Dried-In-Place Nonchrome Polyacrylamide Treatment for Metal U.S. Pafenf 5500,053. Mar. f9, 7996 J. Ouyang and W.L. Harpel, assignors to Befz Laboratories Inc., Trevose, Pa.

An aqueous solution for conversion coating a metal surface consisting essen- tially of 0.05 to 20% of an anionic poly- acrylamide copolymer, 0.05 to 20% of a surfactant, and 0.1 to 10% ammonium hexafluorotitanate.

Real Time Measurement of Etch Rate U.S. Pafenf 5500,073. March 19, 1996 S.G. Barbee ef al, assignors to IBM Corp., Armonk, N. Y

A contactless real-time in-situ chemical etch monitor for providing an indication of a condition of an etching process during etching of at least one wafer in a wet

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chemical etchant bath, comprising two conductive electrodes; a means for posi- tioning the two conductive electrodes in- side the wet chemical etchant bath proxi- mate to but not in contact with the wafer; a means for monitoring an electrical charac- teristic between the two electrodes as a function of time in the etchant bath of at least one wafer, wherein a change in the electrical characteristic is indicative of a state of the etching process; and a means for recording a plurality of values of the electrical characteristic as a function of time during etching.

Process for Regeneration of Acids U.S. Patent 5,500,09&I. March 19, 1996 C.J. Brown and M.A. Sheedy, assignors to Eco-Tee Ltd., Pickering, Canada

A process for regeneration of a volatile acid containing metal salt impurities, com- prising mixing with sulfuric acid to form an acid mixture; concentrating the acid mix- ture in an evaporator to produce a concen- trated acid mixture and acid vapor; con-

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130 METAL FINISHING . NOVEMBER 1996