Elyria Iron & Steel Co. v. Mohegan Tube Co.

(after stating the fasts as above). Defenses insisted, on in pleading and argument are laek of invention and noninfringement; but both produce a single position for defendants, who insist that Johnston’s method is no more than a function of a well designed and operated Parpart machine; and all they do is to make i-ube by such a machine. Some study of the history of electric butt-welding of tubular forms should throw light on this contention, which necessarily implies one of two things — either (sines Parpart’s and Johnston’s patente are separated by 21 years) there was remarkable stupidity on…