Southern Electro-Chemical Co. v. E. I. Du Pont De Nemours & Co.

BUFFINGTON, Circuit Judge.

This patent concerns the denitration of sulphuric and the concentration of nitric acid by one of those continuous, straightway, unbroken unitary operations, to the urge for which so many industries have of late years responded. In that respect we note the general practice in the art here in question had separate, individual processes and apparatus for doing the two different things and making the two different products — one a low tower steam plant for denitrating sulphuric acid; and, second, a batch boiling plant for concentrating nitric acid. The patent here…