POLITZ, Circuit Judge:
Charles F. Martin sued Norman Industries, Inc. under 35 U.S.C. § 271, alleging infringement of United States Patent No. 4,022,028 (the '028 patent) issued to Martin on May 10, 1977. The '028 patent covers an underwater pipe trenching machine cognomened "Mole II." Following a bench trial the district court rendered judgment for Norman Industries, finding the '028 patent invalid under 35 U.S.C. § 102(b) because of public use and sale...
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