The defendants in this patent infringement action filed several motions for leave to amend their answers to include various affirmative defenses, including: (1) the affirmative defense of patent misuse; (2) the affirmative defense of inequitable conduct; (3) a counterclaim for declaratory judgment of non-infringement; and (4) a counterclaim for declaratory judgment of invalidity. Plaintiff REC Software (“REC”) opposed the motions for leave to amend and asserted that the proposed amendments would be futile and the proposed counterclaims and affirmative defenses were duplicative.
REC argued that there was no basis for a defense or counterclaim of patent misuse because an affirmative defense or counterclaim of patent misuse may not be based on infringement or damages positions asserted in litigation. As the district court explained: patent misuse usually applies where a patentee seeks to impermissibly extend the monopoly grant of a patent. U.S. Philips Corp. v. Int‟l Trade Comm‟n, 424 F.3d 1179, 1184-85 (Fed. Cir. 2005). The Federal Circuit has held that certain activities constitute per se patent misuse, such as when a patentee attempts to extend the term of the patent by contractually requiring payment of post-expiration royalties. Virginia Panel Corp. v. MAC Panel Co., 133 F.3d 860, 869 (Fed. Cir. 1997). But other activities have been excluded from the doctrine of patent misuse. For example, Congress has declared that a patent owner may seek “to enforce his patent rights against infringement or contributory infringement” without being guilty of patent misuse or illegal extension of the patent right. 35 U.S.C. §271(d)(3).
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