Summary

Portrait of John Marshall John Marshall Grant v. Raymond — Opinion of the Court

A man finds out there are other machines made like his, which he would like to stop; he sets up inadvertence, gets a new patent, and stops them. If he swears it, who can deny it? It is of younger date, and he swears he meant to describe it. This would furnish irresistible temptation to perjury.
There is a deeper objection. A man makes an invention; he gets a patent, but his specification does not describe it, but describes something else. In the meantime, the public use, not what he has patented, but what he has not. Now, how is the public to be deprived of the use of this?
Source: Wikisource

Portrait of John Marshall John Marshall Grant v. Raymond — Opinion of the Court

At the trial the counsel for the defendants, after the evidence was closed, asked the court, in substance, to instruct the jury that if they should be of opinion that the defendants had maintained and proved the facts alleged in their plea, they must find for the defendants. The court refused this instruction. Ought it to have been refused? If in the opinion of the jury the defendants have proved maintained every fact alleged in the plea on which the issue they are sworn to try is joined, ought not the jury to find that issue for the defendants?
Source: Wikisource

Portrait of John Marshall John Marshall Grant v. Raymond — Opinion of the Court

The court ruled, that though a specification be altogether defective, yet the patent is not void, unless such defect arise from design.
How can these things stand together? If the last proposition be true, all inquiry about the first is idle; unless the question be, whether a man having one good patent may surrender it and take out another good one for the same thing.
It is now matter of settled law, that if a patent be broader than the invention it is void; and it is never inquired whether this arise from design or accident. In nine times out of ten it arises from inadvertence.
Source: Wikisource

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