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LARSEN PRODUCTS CORP. v. PERFECT PAINT PRODUCTS, INC.

Civ. No. 10916.

191 F.Supp. 303 (1961)

LARSEN PRODUCTS CORPORATION, a Maryland corporation, and Phyllis H. Larsen, v. PERFECT PAINT PRODUCTS, INC., a Delaware corporation, and Sta-Dri, Inc. and American Sta-Dri Company, Inc., Intervenor.

United States District Court D. Maryland.

Supplemental Opinion February 24, 1961.

Attorney(s) appearing for the Case

John D. Alexander, Constable, Alexander & Daneker, Baltimore, Md., and Roberts B. Larson, Larson & Taylor, Washington, D. C., for plaintiffs.

Emanuel H. Horn, Baltimore, Md., and Karl W. Flocks, Washington, D. C., for defendants.

THOMSEN, Chief Judge.

This is a patent infringement suit, in which the usual issues of prior art, public use and infringement are complicated by plaintiffs' frequent change of position on what the invention really was.

Briefly, the case is this. Before 1949 Larsen discovered that a polyvinyl acetate emulsion,1 of the type then being sold as a library adhesive, could be used to bind plaster to a smooth surface, such as a wall or...

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