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Allergan’s PTAB Restasis® fight continues, and a recent email tiff before the PTAB between the St. Regis Mohawk Tribe and Mylan has added a further wrinkle to this case.  As we previously blogged, a recent decision by the PTAB (between the University of Minnesota and Ericsson) held that a State’s sovereign immunity against an IPR is waived under the Eleventh Amendment where the State affirmatively asserts the challenged patent in litigation.  That decision appeared to potentially doom Allergan’s strategy of passing off its Restasis® patents to the Tribe to defend against the IPRs.  A recent email exchange between the Tribe and Mylan (the Petitioner in the pending Restasis® IPRs) at the PTAB suggests the University of Minnesota decision may not, in fact, be the nail in the coffin that Mylan had likely hoped.  But it also shows that the Tribe may not be on as sound footing as it is claiming.