United States Federal Circuit

In a patent action brought by Halliburton involving a patent relating to oil field drilling fluids that are fragile gels, a judgment holding that certain independent claims of plaintiff's patent and their asserted dependent claims were invalid as indefinite under 35 U.S.C. section 112, paragraph 2, is affirmed where a claim term in each asserted claim lacked clear meaning to the ordinary artisan.

Appellate Information

• Decided 01/25/2008
• Published 01/25/2008

Judges

• MICHEL, Chief Judge., Before MICHEL, Chief Judge, BRYSON, Circuit Judge, and FOGEL, District Judge.

Court

• United States Federal Circuit

Counsel

• For Appellant:
  
• Edward D. Manzo, Cook, Alex, McFarron, Manzo, Cummings & Mehler, Ltd., of Chicago, Illinois, argued for plaintiff-appellant.   With him on the brief were Monte M. Bond and David L. Patterson, Dykema Gossett PLLC, of Dallas, Texas.


• For Appellees:
  
• John R. Keville, Howrey LLP, of Houston, Texas, argued for defendant-appellee.   With him on the brief were Stephen H. Cagle and Richard L. Stanley.   Of counsel on the brief was S. Calvin Capshaw, Brown McCarroll LLP, of Longview, Texas.