Attorney Work Product in Unsuccessful IPR Challenges
Inter Partes Review (IPR) includes a statutory estoppel provision designed to prevent harassment of a patentee. The statute provides that an IPR challenger that fails to secure cancellation of a challenged patent claim would not only be estopped from making their failed arguments in a later litigation proceeding, but also any arguments that “reasonably could have been raised” in the IPR. The legislative history of the America Invents Act (AIA) indicates that this “reasonably could have raised” standard was fashioned to impart some degree of practicality to the scope of potential estoppel.
Patentees that later face a failed IPR challenger in a litigation proceeding will invariably seek an expansive read of the “reasonably could have raised” aspect of the estoppel provision for patent/publication based grounds of invalidity. In doing so they will seek discovery of challenger search strategies, breadth of prior art knowledge, and the relative timing of such knowledge as compared to the petition filing. In such situations the applicability of work product immunity to such pre-filing materials will be considered.
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