BURNS, District Judge.
Plaintiffs' bill of complaint alleges infringement by defendant of their United States patent No. 1,422,202 for improvements in dry kilns designed for drying lumber. Their letters patent, dated July 11, 1922, called hereinafter the Henderson patent, comprise some 30 claims, but the plaintiffs elect to stand upon the alleged infringement of claim 4.
Defendants deny infringement, allege invalidity, and plead estoppel by conduct in bar...
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