Legal Opinion
Envirotech Corporation D/B/A Eimco Process Equipment Company v. Westech Engineering Incorporated, James v. Larsen and Lowell L. Palm
Court of Appeals for the Federal Circuit
Decided August 28, 1990No. 89-1596PublishedCited by 45 opinions
1Opinion of the Court
OPINION
MAYER, Circuit Judge.
Envirotech Corporation appeals the judgment of the United States District Court for the District of Utah, 713 F.Supp. 372, 11 USPQ2d 1804 (1989), holding U.S. Patent No. 4,391,705 (Cook) invalid under 35 U.S.C. § 102(b) (1982). We reverse and remand.
Background
The patented invention is a ballasted digester cover for use in wastewater treatment plants. Dubbed a “hydroballaster” by its inventors, Envirotech employees Lynn Cook and David Brown, the invention is a floating (as opposed to fixed) cover-type digester consisting of a circular steel top with cylindrical…
2Cases cited5 opinions
- King Instrument Corporation, Plaintiff-Appellant/cross-Appellee v. Otari Corporation, Defendant-Appellee/cross-AppellantCourt of Appeals for the Federal Circuit · 1985
- Umc Electronics Company v. The United States, Cross-AppellantCourt of Appeals for the Federal Circuit · 1987
- Buildex Incorporated v. Kason Industries, Inc.Court of Appeals for the Federal Circuit · 1988
- Rca Corporation v. Data General Corporation, Defendant/cross-AppellantCourt of Appeals for the Federal Circuit · 1989
- Envirotech Corp. v. Westech Engineering, Inc.District Court, D. Utah · 1989
3Cited by45 opinions
- Manville Sales Corporation, Plaintiff/cross-Appellant v. Paramount Systems, Inc., Robert S. Butterworth and Anthony J. DisimoneCourt of Appeals for the Federal Circuit · 1990
- C.R. Bard, Inc. v. M3 Systems, Inc.Court of Appeals for the Federal Circuit · 1998
- Seal-Flex, Inc. v. Athletic Track and Court Construction, Defendant/cross-AppellantCourt of Appeals for the Federal Circuit · 1996
- Weatherchem Corporation v. J.L. Clark, Inc., Defendant/cross-AppellantCourt of Appeals for the Federal Circuit · 1998
- Ferag Ag v. Quipp IncorporatedCourt of Appeals for the Federal Circuit · 1995
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