sent in amounts sufficient to impart varistor properties to the coating film.

Megasonic Transducer for Cleaning Substrates U.S. Pafenf5,355,048. Oct. 11, 1994 B.&f. Esfes, assignor to FSI lntemational Inc., Chaska, Minn.

A megasonic acoustic transducer to generate and direct megasonic acoustic energy into and through a water-based liquid solution for cleaning substrates im- mersed therein, comprising a source of high-frequency electrical energy in the range of 0.5-2.0 megahertz.

Tear-Resistant Coated Abrasive U.S. Pafeti5,355,666. CW. 18, 1884 K.K. Harmon, assignor to Mkmesofa Mining and MI@ Co., Sf. Paul, Minn.

A tear-resistant coated abrasive article comprising a backing, which comprises a film having at least five layers situated one on the other in a parallel array, the layers occurring essentially randomly in the array and being individually selected from a stiff polyester or copolyester and a ductile

polymeric material; and an abrasive layer on a surface of the backing.

Hot-Dip Apparatus U.S. Pafenf5,354,970. Ocf. 11 1994 P. Kntqfer, assignor to Inducfofherm Corp., Ranco- cas, NJ.

A hot-dip coating pot comprising con- tainer means for a coating material in a liquid state for batch coating of continuous metal strip.

Color Pius Clear Coat U.S. Pafenf5,356,669. Ocf. 18, 1994 J.M! Rehfuss and D.L. St. Aubin, assignors fo BASF Corp., Soufhfiekf, Mich.

A composite color-plus-clear coating utilizing a carbamate-functional polymer composition in the clear coat.

Traction-Drive Centrifugal Finisher U.S. Pafenf5,355,638. 03. 18, 1994 SE. HoBnan, Englewood C/it%, N.J.

A method for finishing at least one object, comprising the steps of loading into at least one inner vessel having an outer

Jaynor’s Gold Digger: Makes solid gold for 25@ an ounce.

No more refining of solutions or burnable resins. Just send metal. Like all great ideas, the Jaynor Precious Metal Recovery System-the Gold Digger-is simplicity itself. Instead of using bulky resins, the 38-lb TV-sized Gold Digger attaches to your dragout tank and plates the metal out on a cathode panel. The metal is 80% to 90% pure. Start mining solid gold! JAYNOR can design and build a custom Gold Digger to fit your specific needs.

JAYNORW. RKxluulUIcovlll Write or Call JAYNG INC., P.O. Box 429,

Gary, IL 60013 / (706) 639-7736 Fax (708) 639-7736

Circle 023 on reader information card

surface and containing abrasive media, said inner vessel being inside an outer vessel having an inner surface and an axis, and revolving it at least one inner vessel around the axis of the outer vessel so as to engage the inner surface of the outer vessel with the outer surface of at least one inner vessel at a traction surface of a resilient material, thereby causing at least one inner vessel to rotate.

Conversion Coating U.S. Pafenf5,356,490. ocf. 18, 1994 SE. Do/an and G.A. fieghi, assignors to Henkel Corp., P/ynwrh Meeting, Pa.

A process comprising steps of providing a precursor liquid mixture consisting essen- tially of water and a dissolved component selected from the group consisting of HzTiF,, H,ZrF,, H2HfF6, H$iF,, HsGeFa, H$nF,, HBF,, and mixtures thereof and a dissolved, dispersed, or both dissolved and dispersed component selected from the group consisting of Ti, Zr, Hf, Al, Si, Ge, Sn, and B, the oxides, hydroxides, and carbonates of Ti, Zr, Hf, Al, Si, Ge, Sn, and B, and mixtures of any two or more of these elements, oxides, hydroxides, and carbon- ates.

PC-6 Clean Metal Surfaces

i Avoid Dangerous Acid Problems

Safely and efficiently remove rust, corrosion, oils and grease, or stains from iron, steel, copper, aluminum, brass, bronze, nickel, nickel/silver.

??Environmentally safe ??Easy disposal ??Does not emit harmful fumes ??Can be used hot or cold ??Stable and long lasting

THE SAFER PICKLING COMPOUND

800-695-0792 401-333-5300 . FAX 401-728-8883

I I~II~II~IINII~D4~1I~I1~11~11~~~

Circle 024 on reader information cerd

80 METAL FINISHING . MAY 1995