MAYER, Chief Judge.
Halliburton Energy Services, Inc. appeals the final judgment of the United States District Court for the Southern District of Texas that United States Patent No. 6,017,855 ("'855 patent") is not invalid and infringed. BJ Serv. Co. v. Halliburton Energy Serv., Inc., 00-CV-948 (S.D.Tex. Apr. 23, 2002). Because the district court did not err on the law and the jury's verdict is supported by substantial evidence, we affirm.
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