In patent law, the principle of a machine is the particular means of producing a given result by a mechanical contrivance. Parker v. Stiles, 5 McLean, 44, 63, Fed. Cas. No. 10,749. The principle of a machine means. the modus operandi,’ot that which applied; modifies, or combines mechanical powers to produce a certain result; and, so far, a principle, if new in its application to’a useful purpose, may be patentable. See Barrett v. Hall, 1 Mason, 470, Fed. Cas. No. 1,047.
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