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U.S. GYPSUM CO. v. LAFARGE NORTH AMERICA INC.

No. 03 C 6027.

670 F.Supp.2d 737 (2009)

UNITED STATES GYPSUM COMPANY, Plaintiff v. LAFARGE NORTH AMERICA INC., Lafarge S.A., David Downs, John D. Yockey, Ed Green, William Hartford, Walter Weldon, Kurt F. Kurzshak, and Sidney Spear, Defendants.

United States District Court, N.D. Illinois, Eastern Division.

October 27, 2009.

Attorney(s) appearing for the Case

H. Michael Hartmann, Aaron Ross Feigelson, Bruce Michael Gagala, David M. Airan, Eley O. Thompson, John Patrick Snow, Kevin Cassidy Keenan, Mark E. Phelps, Paul J. Filbin, Paul J. Korniczky, Salim Arif Hasan, Wesley Otto Mueller, Leydig, Voit & Mayer, LTD., Chicago, IL, for Plaintiff.

John W. Treece, Benedict Francis Frey, Douglas I. Lewis, Eric Stephen Mattson, Linda Robin Friedlieb, Paul E. Veith, Rachel D. Sher, Richard J. O'Brien, Robert N. Hochman, Sidley Austin LLP, Seth A. Travis, Charles B. Sklarsky, Seth A. Travis, Jenner & Block LLP, Steven Yovits, Howrey LLP, Chicago, IL, for Defendants.

MEMORANDUM OPINION AND ORDER

REBECCA R. PALLMEYER, District Judge.

In this lawsuit, pending since 2003, Plaintiff United States Gypsum Company ("USG") claims that Defendants Lafarge North America, Inc. ("Lafarge"), Lafarge's parent company, and several Lafarge employees, have infringed USG's patents and stolen confidential information relating to wallboard manufacture. Before the court are motions to bar the testimony of the

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