BLACKMUN, Circuit Judge.
On June 10, 1947, United States Patent No. 2,421,806 for an invention entitled "Cleaning Method and Material Therefor" was issued to Turco Products, Inc., assignee, on an application filed April 14, 1944, by Frank R. Perry. The patent here in suit is Re. 23,422, a reissue dated October 23, 1951, of the Perry patent with additional claims. The patent expired June 10, 1964. By assignment the plaintiff, Agrashell, Inc., acquired Turco's interest...
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