David G. Mangum is a trial lawyer in the intellectual property and antitrust practice group of Parsons Behle & Latimer's Litigation department. He has led PB&L teams in various bench and jury trials, and represented clients in numerous appeals before the U.S. Court of Appeals for the Federal Circuit. He is recognized in Chambers USA and Best Lawyers in America for Intellectual Property Litigation. Benchmark Litigation 2009, listed Mr. Mangum as one of eight "Utah Litigation Stars" and wrote that "David Mangum is one of the, if not the best Intellectual Property litigators, certainly in the region."
Mr. Mangum has represented clients in intellectual property and antitrust lawsuits in federal courts throughout the United States. He has litigated patents pertaining to chemical, electrical and mechanical products and processes in a variety of industries, including oil and gas production, process technology, computer software and hardware and medical treatment. Representative clients include Danaher Corporation, Iomega Corp. and Life Technologies, Inc.
Upon graduation from law school, Mr. Mangum served a judicial clerkship for the United States Court of Appeals for the District of Columbia Circuit. He is an avid Major League Baseball fan, attending games in over 30 major league ballparks.
Envirotech Corp. v. Westech Engineering, Inc., et al., 904 F.2d 1571 (Fed. Cir. 1990) — Represented Envirotech and obtained reversal on appeal of district court judgment finding the patent on a ballasted cover for a sewage digester invalid under the on-sale bar. Frequently cited case on on-sale bar. See R.L. Harmon, Patents and the Federal Circuit 3.4(c), at 93-97.
Natural Reserves Group, Inc. v. Baker Hughes Inc., et al. (333rd Judicial District, Harris County, Texas 2000) — Defended Baker Hughes against claims of misappropriation of trade secrets pertaining to technology for completion of multi-lateral oil wells. Judgment of "no cause" entered after six-week bench trial.
General Motors Corp. v. General Electric Transportation Systems, et al. (E.D. Mich. 2003-2005), 275 F. Supp. 2d 850 (2003), affirmed, 417 F.3d 1203 (Fed. Cir. 2005) — Represented defendant GE in patent infringement action pertaining to bearings utilized in locomotive engine turbochargers. Successfully defeated motion for preliminary injunction. Obtained summary judgment of invalidity based on on-sale bar. Judgment affirmed on appeal.
EEMSO, Inc. v. Iomed, Inc., et al. (N.D. Texas 2005-2006) — Defended industry leader Iomed from claims of misappropriation of trade secrets relating to integrated iontophoretic drug delivery device. Jury returned verdict of "No Cause" on all claims asserted against client after a two week trial.
Thomas & Betts Power Solutions, LLC v. Power Distribution, Inc. (E.D. Va. 2007-2008) — Represented declaratory judgment plaintiff Thomas & Betts in action to declare patent not infringed by a branch circuit monitor made by Thomas & Betts. Conducted a Markman hearing and obtained favorable claim interpretation ruling on critical "circuit board" term. Secured summary judgment of non-infringement based on claim interpretation, and "exceptional case" finding and fee award when patent owner continued to pursue infringement claim after adverse claim construction.