In re YARN PROCESSING PATENT VALIDITY LITIGATION.
SAUQUOIT FIBERS COMPANY, Plaintiff-Appellee,
v.
LEESONA CORPORATION et al., Defendants-Appellants.
KAYSER-ROTH CORPORATION (in its own name and d/b/a Kayser-Roth Hosiery Company and Kayser-Roth Hosiery Co., Inc.), Plaintiff-Appellee,
v.
LEESONA CORPORATION, Defendant-Appellant.
LEESONA CORPORATION, Plaintiff-Appellant,
v.
The DUPLAN CORPORATION et al., Defendants-Appellees.
United States Court of Appeals, Fifth Circuit.https://leagle.com/images/logo.png
July 29, 1974.
July 29, 1974.
Attorney(s) appearing for the Case
Willis H. Flick, Miami, Fla., James H. Wallace, Jr., Nolan E. Clark, Washington, D. C., Robert F. Conrad, Ft. Lauderdale, Fla., William Schultz, New York City, for Leesona Corp.
L. A. Schroeder, Miami, Fla., for Warren Seem.
James L. Armstrong, III, James W. Crabtree, Miami, Fla., John J. McAleese, Jr., Plymouth Meeting, Pa., for Permatwist Co. et al.
William W. Beckett, Washington, D. C., Richard G. Schneider, Philadelphia, Pa., Henry Burnett, Miami, Fla., for Sauquoit Fibers Co.
Anthony F. Phillips, New York City, William K. West, John W. Malley, Washington, D. C., Paul B. Bell, Charles B. Park, Charlotte, N. C., for Duplan Corp. and Kayser-Roth Corp. et al.
David Klingsberg, New York City, Hugh Latimer, Washington, D. C., for Kayser-Roth Corp. et al.
Edward S. Irons, Mary Ellen Sears, Washington, D. C., for Celanese Co. and Fiber Industries, Inc., amicus curiae.
Before JONES, THORNBERRY and COLEMAN, Circuit Judges.
United States Court of Appeals, Fifth Circuit.
THORNBERRY, Circuit Judge:
The principal issue in this consolidated litigation is the validity of U.S. Patents numbered 2,803,105, 2,803,108 and 2,803,109, collectively called the "false twist" or "single heater" patents, which are presently owned by Leesona. The patents disclose both an apparatus and an efficient, economical means of texturizing synthetic thermoplastic yarns. The teachings of the patents laid the technological...
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