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The Supreme Court today ruled unanimously that the burden of proving patent infringement rests with the patent holder, even in cases where the parties had agreed upon a licensing deal in the past. The case at issue, Medtronic, Inc. v. Mirowski Family Ventures, involved implantable heart stimulation devices (pacemakers) which were licensed by Mirowski to Medtronic in 1991. In late 2007, Medtronic filed an action with the U.S. District Court of Delaware seeking declaratory relief that its new line of devices did not infringe upon the Mirowski patents. The trial court entered a judgment of non-infringement in Medtronic's favor, which was reversed in 2012 by the Federal Circuit, based on a holding that the trial court did not properly allocate the burden of proof in the initial proceedings.

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