The appellant National Lead Company brought suit under Rev.Stat. § 4915, 1 seeking a patent on a well-drilling fluid. After a hearing, the District Court dismissed the complaint. National Lead Co. v. Marzall, D.C.D.C.1952, 109 F.Supp. 20. This appeal followed.

The opinion of the District Court (Judge Curran) appears to us to state accurately the factual situation and the reasons why the complaint must be dismissed. It correctly interprets and applies our decision in National Lead Co. v. Marzall, 1952, 91 U.S.App.D.C. 63, 198 F.2d 296.

The judgment of the District Court will accordingly be

Affirmed.