Drumhead Co. of America v. Hammond

McVICAR, District Judge.

Defendant contends that the patent in suit is invalid for the reason that it lacks invention. Drumheads, prior to the invention of the patent in suit, required frequent adjustment by reason of moisture and changes in temperature. The patent in suit overcomes this objection by the use of a fabric drumhead, the fabric being painted with a solution of a cellulose derivative and a plasticizer. Drumheads made in accordance with the patent in suit have gone into commercial use. The elements of the drumheads of the patent in suit are old. The combination of the elements is…