SWAN, Circuit Judge.
This is an appeal by defendant, hereafter called Spunize, from an order entered in a declaratory judgment action wherein the plaintiff, hereafter called Bancroft, sought an adjudication that Patent No. 2,715,309 owned by Spunize is invalid. The patent contains only a single claim. This is for a product, namely, a yarn of synthetic resin material whose filaments are crimped in a particular manner.
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