| Mass. | Mar 17, 1877
The plaintiff seeks to recover a balance of the purchase money due him from the defendants under an assignment of certain letters patent of the United States. He put in evidence the assignment, dated September 23,1873, whereby it appears that, in consideration of $2000 paid by the defendants, he sold and conveyed to them his entire right, title and interest in the letters patent, issued to him August 5, 1873, for an improvement in folding-tables. The defendants offered in evidence a'paper writing, dated September 20,1873, signed by the defendants, in which they agree to pay the plaintiff $900 in their notes when he shall have obtained an improved patent in folding-tables securing the right of sliding legs, and assigned the same to them. The writing also recites that a patent for folding-tables had been granted to the plaintiff, and contains the clause: “ Should the application for patent in said improvement be rejected, he, the said Hunde, will give us proof that no other parties can make, use or vend tables with sliding legs.”
It is evident that the parties changed the contract contemplated by this paper; and the outright assignment of the letters patent of August 5, for the sum of $2000, was made three days after, and makes no mention of the conditions named in the previous paper. They were separate and distinct agreements, containing inconsistent stipulations, and the second was in substitution of and annulled the first.
We are of opinion that the evidence was not competent for that purpose. Its effect would be to engraft, by an oral agreement, new stipulations upon a written contract, materially changing its character and provisions. It would import.into the written assignment a condition that the consideration of $2000 was not to be paid in cash but by notes, and also other conditions relating to the procurement of an additional patent, and the furnishing of certain proof if the application for the additional patent was rejected.
In Ryan v. Hall, 13 Met. 520, there was a written memorandum of a sale of land, to be paid for at so much a foot; and it was held that evidence was inadmissible to prove that it was agreed, when the memorandum was executed, that one quarter part should be paid in cash, and three quarters in notes, secured by mortgage, in one, two and three years; the effect of such agreement being to vary the written contract, which was to pay cash on demand. So in Underwood v. Simonds, 12 Met. 275, by the terms of a note, the defendant promised to pay the plaintiff absolutely a sum of money, and he was not allowed to prove that he was to pay it on condition that he could collect a certain other note, and it was held that the evidence had no tendency to prove want or failure of consideration.
In Howe v. Walker, 4 Gray, 318, the defendant had made a quitclaim deed to the plaintiff, with a covenant of warranty against the demands of all persons claiming under him. There was a mortgage on the premises not created by the defendant, and the plaintiff attempted to prove that, at the time the deed was made, the defendant, for the same consideration named in the deed,, agreed orally that he would pay and discharge the
The cases, relied on by the defendants, of Clark v. Deshon, 12 Cush. 589, Preble v. Baldwin, 6 Cush. 549, 553, and Clapp v. Tirrell, 20 Pick. 247, have no application to the facts presented in this case. Exceptions sustained.