Manufacture of printed circuit boards

mato complex, 20 to 400 g/L of an acid sufficient to create a pH value less than I. and at most 5 g/L free amidosulfuric acid; subjecting the bath to a temperature between 60 and 90°C; and operating at an electric current density of 1 to 4 A/dm’ for a sufficient period of time to deposit a bright layer of platinum on the article.

Manufacture of Printed Circuit Boards U.S. Patent 5,620,612.Apr 15, 1997 I? Kukanskis and J.J. Grunwald, assignors to MacDermid Inc., Waterbury, Conn. A process for producing printed circuit boards, which comprises forming holes in a desired array in copper clad laminate; activating the holes to accept plating thereon: thereafter applying an imaged etch resist; etching any exposed copper to form circuits; stripping the etch resist: optionally, applying an imaged plating mask; plating the holes subsequent to the formation of the circmts: and if a plating mask is used, then stripping the plating mask.

R.J. LMfy and ED. Sessa, assignors to NY/ok Fastener Corp., MaComb, MC/I. A method and apparatus for applying a resin coating to both internal and external threads of a threaded fastener comprising providing a powdered resin reservoir; generating a first airborne powdered resin stream from the powdered resin in the reservoir; transporting the fastener along a path, which first passes through a heating zone and thereafter through the first resin stream to apply resin coating onto one of the internal or external threads; and generating a second powdered resin stream directed at the fastener to apply resin coating to the other of the internal or external threads. the second stream being generated by positioning a resin receiver to traverse the first resin stream and thereby provide a powdered resin supply for the second powdered resin stream.

Aqueous Coating Composition U.S. Patent 5,620,747. Apr. i5, 1997 A.E. Laura ef ai., assignors to A-Line Producls Corp., De trait

Resin-Coated Fastener U.S. Patent .5,620,741

Apr. 15, 1997

An aqueous coating composition comprising effective film-forming amounts of

Ultra-LifeTM Platinized

up to 40% of a polyol having a molecular weight of 62 to 500; 0.5 to 40% of a resin selected from halogenated polyolefinic resin materials, halogenated vinyl resins. epihydrin resins, halogenated epoxy resins, and mixtures thereof; 0.05 to 15%’ of a surfactant; an amine selected from primary. secondary. and tertiary aliphatic amines having an amine functionality of I to 7. and mixtures thereof; and up to 05% water, and wherein the composition i\ substantially free of aromatic organic solvents.

Method for Applying Metallic Paint U.S. Patent 5,620,750. Apr. 15, 1997 S. Minoura et al, assignors to Honda Glken Kogyo KK, Tokyo A coating method comprising first and second processes using a rotary atomizer with a bell-shaped atomizing head to apply a metallic paint, wherein an amount of the metallic paint ejected from the rotary atomizer, a shaping air pressure and a reciprocating coating speed of the rotary atomizer are maintained at the same or approximately the same values fol both the first

Anodes

Our anodes live longer, more productive lives. HERAEUS DE NORA anodes offer some shining features: l l l l

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Extended anode life. Iricreased production with faster plating speeds. ln~solubleplatinized titanium or niobium (columbium)i. 100, 150, 250 microinch thicknesses available. Or we’ll custom-fabricate for your needs. Precious metal plating, high-speed. Industrial and decorative plating. Base metal plating copper-nickel-chrome. Electra winning. We’ll recoat your existing anodes too.

For full details on Ultra-LifeTM platinized anodes backed by more than a century of experience in precious metals for industry, writ’e or call: HJCRAEUS DE NORA Inc. 2655 Route 22 West, Union, NJ 07063

800/762-2101

Circle 030 on reader Information card 86

METAL

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JANUARY

1998