On December 19, 2017, an expanded panel of the Patent Trial and Appeal Board (PTAB) ruled that the state of Minnesota waived its Eleventh Amendment immunity to challenges to patent validity by inter partes review (IPR) by filing suit in federal court alleging infringement of the same patent being challenged by IPR.  In Ericsson Inc. and Telefonaktiebolaget LM Ericsson v. Regents of the University of Minnesota (IPR2017-01186; IPR2017-01197; IPR2017-01200; IPR2017-01213; IPR2017-01214; IPR2017-01219), Petitioner Ericsson Inc. filed IPR petitions against five University of Minnesota patents covering wireless communications technology. In response, the University filed a motion to dismiss, arguing its Eleventh Amendment sovereign immunity exempted the patents from IPR challenge.

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