by Dennis Crouch In Energy Heating v. Heat On-The-Fly, the Federal Circuit affirmed the lower court’s holding that Heat On-The-Fly’s U.S. Patent No. 8,171,993 is unenforceable due to inequitable conduct. The underlying invention involves a portable system for preparing a heated water and proppant (e.g. sand) mixture for use in hydraulic fracing. Mr. Hefley, sole inventor and founder of Heat On-The-Fly, filed his priority provisional patent application back in September 2009 that eventually led to the ‘993 patent. The problem: By September 2008 (one year before filing), Heafly and his company had provided his services to dozens of “frac jobs” — collecting almost $2 million in revenue. Mr. Hefley admitted at trial that he and his companies used water-heating systems containing all the elements of claim 1 on at least 61 frac jobs before the critical date. The court further found that invoices reflected that Mr. Hefley’s…
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