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KEUFFEL & ESSER CO. v. PICKETT & ECKEL

No. 9939.

182 F.2d 581 (1950)

KEUFFEL & ESSER CO. v. PICKETT & ECKEL, Inc., et al.

United States Court of Appeals Seventh Circuit.

June 5, 1950.

Attorney(s) appearing for the Case

R. Morton Adams, New York City, Edwin S. Booth, Chicago, Illinois (Dawson, Ooms, Booth & Spangenberg, Chicago, Ill., J. Russell Juten, Washington, D. C., of counsel), for appellant.

Francis W. Parker, Jr., Clarence F. Poole, E. A. Stephan, Leo F. Tierney, Parker & Carter, Chicago, Ill., for appellees.

Before KERNER, FINNEGAN, and LINDLEY, Circuit Judges.

KERNER, Circuit Judge.

The question is whether the determination by the District Court that two patents on slide rules are void for want of invention is clearly erroneous.

Plaintiff, a manufacturer and designer of slide rules, is the owner of Patent No. 2,170,144, issued to Lyman M. Kells, Willis F. Kern and James R. Bland on August 22, 1939, upon an application filed April 17, 1937, hereinafter referred to as the "Kells Patent," and Patent No. 2,422,649,...

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