David Davis, Nicolson Pavement Company v. Jenkins…
“ An assignment of an interest in an invention secured by letters-patent, is a contract, and like all other contracts is to be construed so as to carry out the intention of the parties to it. It is well settled that the title of an inventor to obtain an extension may be the subject of a contract of sale, and the inquiry is whether the instrument of sale employed in this case, did secure to the purchaser an interest not merely in the original letters-patent, but in any subsequent extension of them. ”
