McKAY, Circuit Judge.
At great expense, plaintiff Black, Sivalls & Bryson, Inc. (BS&B) acquired the patent and developed a market for a device designed to uniformly heat certain industrial fluids. The process involves the passage of fluids through tubes which are warmed by superheated air from a burner. The principal design difficulties in this process relate to the optimum tube wall thickness for heat convection and the best method of passing the heat uniformly...
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