In January 2013, Restoration Industry Association (RIA) filed suit in U.S. District Court against David Hedman and ThermaPure to invalidate patents held by ThermaPure, TPE Associates, and Hedman. Defendants argued that since they had never sought to enforce those other patents and there is no indication at this time that they have attempted to enforce them, those counts should be dismissed. Judge James V. Selna agreed and dismissed all patents from case except U.S. Patent No. 6,327,812.
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