On summary judgment, the United States District Court for the Southern District of Texas held AllVoice Computing PLC's ("AllVoice's") U.S. Patent No. 5,799,273 ("the '273 patent") invalid because claims 60, 61, and 67 were indefinite under 35 U.S.C. § 112 ¶ 2 and because the patent specification did not disclose the best mode of practicing claim 73. Allvoice Computing PLC v. Nuance Commc'ns, Inc., H-02-4471 (S.D. Tex. Feb. 22, 2006). Thus, the district court did not decide whether Nuance Communications, Inc.’s ("Nuance’s") Dragon Naturally Speaking software infringes the '273 patent on voice recognition technology. Because the district court erred in applying both indefiniteness and best mode, this court reverses and remands.