Ultralow-VOC Polyurethane Coatings U.S. Patent 5,670,599. Sept. 23, 1997 S.L. Bassner, assignor fo Air Products and Chemicals Inc., Allenfown, Pa.

An isocyanate mixture suited for pro- ducing polyurethane coatings, which com- prises IO to 90 weight parts of a prepoly- mer comprising the reaction product of a diisocyanate component and a long-chain polyol component and 10 to 90 parts of a polyisocyanate crosslinker.

Aqueous Two-Component Polyurethane U.S. Patent 5,670,600. Sept. 23, 1997 E. Nienhaus and U. Meisenburg, assignors to BASF lacke and Farben AG, Muenster-Hiltrup, Germany

An aqueous two-component polyurethane coating composition comprising an aqueous dispersion of a polyacrylate resin and a poly- isocyanate component as crosslinking agent.

Apparatus for Cleaning of Conveyors U.S. Patenf 5,671,838. Sept. 30, 1997 J./f. Bowman. Oak Lawn, 111.

A cleaning assembly for an endless con- veyor as such conveyor moves in a prede- termined direction along a portion of its path of movement,

Spray Gun U.S. Patent 5671,888. Sept. 30, 1997 P Smith, Toronto, Ontario, Canada

A spray gun comprising a barrel having a lengthwise passage: a handle extending transversely from the barrel; and a spray head mounted to the barrel.

Centrifugal Barrel Finishing Machine U.S. Patent 5,672.094. Sept. 30, 1997 K. Nishimura et al., assignors to Sinfobrafor Ltd., Nagoya, Japan

A centrifugal dry barrel finishing ma- chine comprising a plurality of barrel pots, each having an axis of rotation and a mass inside, said mass comprising dry media and at least one workpiece; and means for ro- tating the barrel pots about their respective axes of rotation and for revolving the barrel pots about an axis of revolution.

Abrasive Article U.S. Patenf 5,672,097. Sept 34 1997 JL Hoopman. assignor fo 3M Co., St. Paul, Minn.

An abrasive article comprising a back- ing having a major surface having de- ployed in fixed position thereon first and second three-dimensional abrasive com- posites, each comprising abrasive particles

Loatmg II hickness Gages for ALL Metal Substrates n Rugged, fully electronic gages non-destructively measure coating thick- ness on Ferrous and Non-Ferrous metals

n Models to suit special measuring needs, i.e. anodizing, thick coatings, statistical/computer analysis, etc.

n World’s first combinatron gage to automatically recognize substrate

n Special application probes for small and hard-to-reach areas

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Toll Free l-800-448-3835 l Phone: 315-393-4450 FAX: 315-393-6471 * Web: http://www.defelsko.com

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ENVIRONMENTAL PRODUCTS

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METAL FINISHING . MAY 1998 89