resistant, thermoplastic binder material and a fibrous reinforcing material to form a softened, moldable mixture; forming a shaped object out of the softened, mold- able, mixture; cooling and solidifying the shaped object to form the hardened backing for the coated abrasive article; applying a layer of an adhesive to the hardened back- ing; and applying a layer of abrasive ma- terial to the layer of adhesive.

Solvent Cleaning Process U.S. Patent 5,417,766. May 23, 1995 C. W. Smith et al., assignors to Autoclave Engineers Inc., Erie, Pa.

A method for precision cleaning of a workpiece comprising placing the work- piece in a pressurizable vessel with a re- movable lid and within an inner tank open at the top; supplying a primary solvent to the inner tank, which is liquid at ambient temperatures and pressures and can be rinsed away by carbon dioxide pressurized to at least liquefying pressures without con- taminating the interior walls of the pressur- izable vessel; flushing the primary solvent through the pressure vessel without con- taminating the interior walls of the pressure

vessel; draining the inner tank to remove the primary solvent; supplying carbon di- oxide to the pressure vessel pressurized to at least liquefying pressures and flushing it through the vessel by withdrawing it from near the bottom of the inner tank; recycling the carbon dioxide by passing it through a letdown valve to a liquid/vapor separator and then passing the vaporized carbon di- oxide through an adsorption media filter prior to recondensing to a liquid; and si- multaneously withdrawing carbon dioxide from the tank and from a location in the vessel outside of the tank.

Vapor/Immersion Cleaning Process U.S. Patent 5,4 17,769. May 23, 1995 D.R. Gerard et al., assignors to Detrex Corp., Southfield, Mich.

A microprocessor-controlled cyclical process of solvent cleaning soils from parts in an open-top apparatus comprising a cleaning mode cycle and a shut down cy- cle, said apparatus having a boil tank con- taining an agitated admixture of high vapor tension rinse liquid and low vapor tension cleaner liquid and a rinse tank-containing

high vapor tension rinse liquid and a vapor space overlying the tanks into which high vapor tension rinse vapor rises and con- denses and the high vapor tension rinse distillate circulates into the rinse tank and cascades continuously from the rinse tank into the boil tank over the upper end of the common wall separating the tanks during operation of the cleaning mode cycle.

Process for Titanium Sheet Pickling and Passivation U.S.Patent5,417,775. May23, 1995 C. Pedmzini, assignor to ITB S.r./., Milan, My

A process for the pickling of titanium manufactured articles or intermediates pro- duced by procedures including heat treat- ment, followed by passivation of the pick- led material, consisting of placing the material to be treated in a pickling bath kept at a maximum temperature of SC, said pickling bath comprising 20 to 50 g/L sulfuric acid, at least 15 g/L ferric ions, 10 to 30 g/L hydrofluoric acid, 1 to 20 g/L stabilized hydrogen peroxide, and a maxi- mum of 1 g/L of additives selected from the group consisting of emulsifiers, wetting agents, and polishing agents; said bath be-

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METAL FINISHING ?? JANUARY 1996 91

ing fed continuously with a minimum air flow of 3 cubic meters per hour per cubic meter of bath volume through an air feed, which distributes the flow in the liquid mass of the bath; maintaining the concen- tration of peroxide at a quantity to provide a bath redox potential of -200 to 0 mV, and if necessary adding sufficient amounts of H,SO, and HF to provide a bath pH not higher than 1.5; and thereafter placing the material to be treated in a passivation bath consisting of an aqueous solution contain- ing 4-10 g/L of free HF, a maximum of 1 g/L Fe, said bath being substantially free of H,SO, and being continuously fed with a sufficient amount of stabilized H,O, to ad- just the bath redox potential to 500-600 mV, said passivation bath being maintained at room temperature with a sufficient air flow to agitate the liquid.

Desmutting Aluminum Alloys U.S. Patent 5,417,819. May 23, 1995 A. L. Askin and RB. Schultz, assignors to Aluminum Co. of America, Pittsburgh

A method of forming a highly reflective surface on aluminum alloys, comprising cleaning a body formed from an aluminum

alloy; electrobrightening the body; and desmutting the surface of the freshly brightened body without etching, the desmutting bath comprising 10-100 vol- ume percent nitric acid; O-60 volume per- cent sulfuric acid; O-50 volume percent water; and at least 15 g/L of a source of fluoride.

Continuous Electroplating Apparatus U.S. Patent $417,828. May 23, 1995 S. Sefgio, Trezzo d’Adda (Mano), #a/y

An electroplating plant for the electro- lytic deposition of metals on flat compo- nents such as printed circuit boards, ori- ented parallel to a direction of feed and being continuously supplied via a closed- loop driving device for the transmission and supply of cathode current to the boards characterized in that it has at least one pair of electrolytic cells each one being pro- vided with a feed aperture and an aperture for the outflow of the electrolytic solution supplied continuously via appropriate means for drawing the same from a recov- ery tank, each cell being provided with

anodes and means for regulating the flow of the electrolytic solution.

Electroplating Apparatus U.S. Patent 5,417,829. May 23, 1995 R.E Zecher, assignor to Tumbleveyor Inc., Huntingdon Va//ex Pa.

Apparatus for surface treatment of small parts in a series of treatment solutions con- tained in a series of separate tanks adapted to contain treatment solution up to a pre- determined level established with a tank, said tank being spaced in side-by-side re- lationship, comprising a belt-type conveyor for each tank of the series; means forming a concave profile to the upper run of each belt-type conveyor, and drive means in- cluding rotative supports at the loading and discharge ends of the upper run for effect- ing advance of the upper run towards the discharge zone.

Injection Plating Apparatus U.S. Patent 5,417,830. May 23, 1995 K. Tsurushima, assignor to KK Toshiba, Kawasaki, Japan

An injection plating apparatus compris- ing cavity boxes for fixing a semiconductor

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