Marlin Firearms Corp. v. United States

Upon the facts established by the record, which have been set forth in detail in the findings and need not be repeated here, we are of opinion that the patent is invalid for lack of invention in that it involved no more than mechanical skill.

Plaintiff devotes considerable discussion to the proposition that the synchronization of machine guns for aircraft firing was a difficult and delicate problem, the solution of which was a commendable accomplishment. This problem, however, had been successfully mastered by Constantinesco in the development of his synchronizing gears, which had been…