Nos. 88-1475, 88-1477.

877 F.2d 1561 (1989)

ENVIRONMENTAL INSTRUMENTS, INC., Plaintiff-Appellant, v. The SUTRON CORPORATION, Defendant/Cross-Appellant.

United States Court of Appeals, Federal Circuit.

June 15, 1989.

Attorney(s) appearing for the Case

Philip G. Koenig, Wolf, Greenfield & Sacus, P.C., Boston, Mass., argued for plaintiff-appellant. With him on the brief was James H. Laughlin, Jr., Benoit, Smith & Laughlin, Arlington, Va.

John S. Hale, Gipple & Hale, McLean, Va., argued for defendant/cross-appellant. With him on the brief were James W. Gipple and Juan Chardiet.

Before RICH, NIES and MICHEL, Circuit Judges.

RICH, Circuit Judge.

These appeals are from a May 19, 1988, judgment of the United States District Court for the Eastern District of Virginia, T.S. Ellis, III, Judge. 688 F.Supp. 206, 8 USPQ2d 1897. Plaintiff Environmental Instruments, Inc. (EII) brought suit alleging that defendant The Sutron Corporation (Sutron) had infringed the sole claim of EII's U.S. Patent No. 3,900,819 ('819) on a "Thermal Directional Fluid Flow Transducer...

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