Donble use
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In patent law. An application of a principle or process, previously known and applied, to some new use, but which does not lead to a new result or the production of a new article.
De Lamar v. De Lamar Min. Co. (C. C.) 110 Fed. 542; In re Blandy, 3 Fed. Cas. 071.