Stephen Johnson Field,
Marsh v. Nichols Shepherd Company…
“ But the patent for an invention conveys nothing which the government owns or its predecessors ever owned. The invention is the product of the inventor's brain, and if made known would be subject to the use of any one, if that use were not secured to him. Such security is afforded by the act of congress when his priority of invention is established before the officers of the patent-office, and the patent is issued. The patent is the evidence of his exclusive right to the use of the invention ”
