PATENTS GRANTED In the Metal Finishing Fie,ld Printed 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. 2023 I,

Optically Variable Paint U.S. Patent 5653,792. Aug. 5, 1997 R. W. Phillips et a/., assignors to Flex Products Inc., Santa Rosa, Calif.

reflecting layer having first and second sur- faces and a multilayer thin film comprising at least one dielectric layer.

An optically variable paint for obtainmg a color shift between two predetermined colors comprising a liqurd medium and

optically variable flakes disposed in the liuuid medium. the ooticallv variable flakes

Zinc Phosphate Coating Composition U.S. Patent 5653,790. Aug. 5, 1997 N.A. Fotinos ef al, assignors to PPG industries Inc., Pittsburgh

br’ing comprised of&a thin film structure An aqueous acidic composition for

having an aspect ratio of at least 2 to I forming a zinc phosphate, tungsten con-

resprctivcly for surfaces parallel 10 the taining coating on a metal substrate com-

plants of the layers and surfaces perpen- prising 0.4 to 3.0 g/L of zinc, 4 to 20 g/L

dicular to the planes of the layers, each of phosphate, 0.005 to IO g/L of tungsten, and

the flakes being in the form of an interfer- 0.5 to 20 g/L of an accelerator selected

ence slructure comprising an opaque metal from the group consisting of an oxime.

ULTRASONIC AQUEOUS CLEANERS Sonicor precision cleaning systems combine the latest in ultrasonic cleaning technology with today’s aqueous and semi-aqueous chemistry. They provide superior performance while elirninating CFC’s from the workplace.

SONICOR soI~Jlc!3A IAArulUFAClr~JR&b IMMERSIBLES...

A\ \,\JJDE ;?&yGJ 0;: &.)U1pp&~y-J- $0X A\!>[.

When the use of

.4PPLJ~~rlouuls. transducerized tanks is not

practical. * Lead Zmmnate-Tkmate Sandvxh Transducers

*Stainless Steel Construction High Eficlency Sweep Frequency Generator

Circle 081 on reader information card

hydroxylamine sulfate, and mixtures thereof.

Method for Cleaning and Drying Metal Articles U.S. Pafent 5,653.820. Aug. 5, 1997 M. Higashino, assignor to Minebea Co. Ltd., Japarl

A ntethod of cleaning metal articles compriyinp alkaline washing; rinsing with deoxidized rinsing water; producing dry vapor having no liquid phase from water in

a boiler; removing water by hlowing the dry vapor evenly in a nonoxygen state so as to prevent formation of rust on the sur-

faceof the metal articles. and drying in a heated atmosphere.

Aerospace Paint Overspray Collectic System - 99.993% Efficient*

The XFP-6000 paint overspray system IS speclhtally deslgned lor the collecl~on 01 aerospace chromate coating overspray, vlrlually elimlnaiirlq dangerous chromium emlsslons up Ihe slat three-stage system can also be easily adapled 1o older, two-stage paint lmishing hnes When 6OW was lesled wdh a waler reducible epoxy poiyamlde primer, it achteved a 99 993% eillcle only 1.0 WG hnal pressure drop When lested Ior ftacllonal elhclencies, Ihe system’s avetag efliciency was 98 45% on 3 0 5 0 mcron-size IpartIcles (lest results avatiable upon request

High Quality - Cost Effective

EPA Indacds e !g and 11189

k This the XFP- incy al e )

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80 METAL FINISHING l APRIL 1998