definiens: means to contest or Assist in the contesting of the validity or enforceability of anyof the Patents, in whole or in part, in any court, arbitration proceeding or other tribunal, includingthe United States Patent and Trademark Office and the United States International TradeCommission . For the avoidance of doubt, the term includes : ( a ) filing an action under28 U.S.C. § § 2201 - 2202 seeking a declaration of invalidity or unenforceability of any Patents ; ( b)citation to the United States Patent and Trademark Office pursuant to 35 U.S.C. § 301 of priorart patents or printed publications or statements of the patent owner concerning the scope of anyof the Patents ; ( c ) filing a request under 35 U.S.C. § 302 for re - examination of any of thePatents ; ( d ) filing, or joining in, a petition under 35 U.S.C. § 311 to institute inter partes review ofany Patents or any portion thereof ; ( e ) filing, or joining in, a petition under 35 U.S.C. § 321 toinstitute post - grant review of the Patents or any portion thereof ; ( f ) provoking or becoming a partyto an interference with an application for any of the Patents pursuant to 35 U.S.C. § 135 ; ( g ) filingor commencing any re - examination, opposition, cancellation, nullity or similar proceedingsagainst any of the Patents in any country ; or ( h ) any foreign equivalents of subsection ( a)through ( g ) applicable in the Territory