hollow interior cavity connected to the openings, which comprises the steps of spraying powder on the exterior of the workpiece; positioning a pair of inlet hood assemblies respectively at the side open- ings on each side of the workpiece; con- necting the pair of inlet hood assemblies to a vacuum source; and purging the cavity of excess powder by extracting through the inlet hood assemblies.

Plural-Component Spray Painting System U.S. Patent 5,328,093. July 12, 1994 A. Feife/, assignor to Grace Inc., Go/den Va//ey, Minn.

A water-based plural-component sys- tem, comprising an electrostatic spray gun having an efectrically-charged tip for dis- pensing a homogeneous mixture of an electrically more-conductive component and an electrically less-conductive compo- nent.

Shot Peening Machine U.S. Patenf 5327,755. July 12, 1994 R.A. Thompson, assignor to Genera/ Electric Co., Schenectady, N. Y

A constant flow control device for a pressure-pot shot-peening system, com-

prised of an air supply; an air mass flow controller operatively connected to the air supply wherein the air mass flow controller is further comprised of a choked-nozzle flow control; a pressure pot operatively connected to the air mass flow controller; and a nozzle operatively connected to the pressure pot.

Microetchant for Copper Surfaces U.S. Patent 5,328,561. July 12, 1994 R.A. Letize et al, assignors fo MacDermid Inc., Waterbury, Conn.

A process for microetching a copper surface to remove copper therefrom and produce a remaining copper surface, which is microroughened, comprising contacting with an aqueous solution of cupric ion, ammonium hydroxide, and/or a source of ammonium ion, and a chelator for cupric ion other than ammonia selected from the group consisting of monoethanolamine, ethylenediamine tetraacetic acid, salts of ethylenediamine tetraacetic acid, and mix- tures thereof, said contacting being at a composition temperature of 85- 13O’F.

Dry-In-Place Conversion Coating U.S. Patent 5,328,525. July 12, 1994 EM. M&go et al, assignors to Betz Laboratories Inc., Trevose, Pa.

An aqueous acidic solution effective in forming a dried-in-place nonchromate con- version coating on a surface of Galvalume aluminum or alloys thereof consisting es- sentially of l&60% by weight of a polymer selected from the group consisting of polyacrylic acid and copolymers and ho- mopolymers thereof; 0.2-20% by weight molybdate, and 10-60% by weight dihy- drohexafluo acid.

Acid Copper Electroplating Baths U.S. Patent 5,328,589. July 12, 1994 S. Martin, assignor to EnthowOMl Inc., Warren, MiCh.

An improved high-acid low-copper elec- troplating bath comprising 13-45 g/L cop- per ions; 45-262 g/L of an acid with effective amounts of a bath-soluble multi- functional polymer, said polymer compris- ing at least three distinct ether groups, wherein one of the ether linkages is derived from an alcohol, a bisphenol A or an epoxy

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METAL FINISHING . APRIL 1995 95