Summary

Portrait of Stephen Johnson Field 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
Source: Wikisource

Portrait of Stephen Johnson Field Stephen Johnson Field Marsh v. Nichols Shepherd Company…

With respect to patents for land, we have had frequent occasion to assert their inviolability against collateral attack, where the land department had jurisdiction, and the land formed part of the public domain, and the law provided for their sale. But we have also held that if the land patented was never the property of the United States, or had been previously sold, or reserved for sale, or the officers had no authority to execute the instrument, the fact could be shown in any action or proceeding whenever the patent is offered in evidence.
Source: Wikisource

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