Under 315(b) of the AIA (America Invents Act), Inter Partes Review “may not be instituted if the petition requesting the proceeding is filed more than 1 year after the date on which the petitioner, real party in interest, or privy of the petitioner is served with a complaint alleging infringement of the patent.” The Click-to-Call decision revolves around whether the time-bar applies when a complaint has been voluntarily dismissed without prejudice.
In 2001, the patent in this case, U.S. Pat # 5,818,836, had been exclusively licensed to Inforocket, who filed a patent infringement suit asserting the ‘836 patent against Ingenio (then under its previous name, Keen). Ingenio then purchased Inforocket as a wholly-owned subsidiary, and the parties stipulated to dismiss the suit without prejudice. Subsequently the ‘836 patent was acquired by Click-to-Call. On May 29, 2012, Click-to-Call filed suit asserting the same ‘836 patent against a number of defendents, including Ingenio, leading to the filing of this IPR. 
In an opinion designated as precedential by the PTAB, the Board ruled that a voluntary dismissal of a suit creates an exception to the 315(b) time-bar. “The Federal Circuit consistently has interpreted the effect of such dismissals as leaving the parties as though the action had never been brought.” Based on the premise that a voluntary dismissal serves to nullify the existence of a suit, the PTAB held that the one-year time limit for filing an IPR would be nullified along with it.
On appeal, the Federal Circuit disagreed and found that the PTAB committed legal error in its determination. The Federal Circuit overturned the PTAB ruling. As the decision explains “the provision unambiguously precludes the Director from instituting an IPR if the petition seeking institution is filed more than one year after the petitioner, real party in interest, or privy of the petitioner ‘is served with a complaint’ alleging patent infringement. Simply put, § 315(b)’s time bar is implicated once a party receives notice through official delivery of a complaint in a civil action, irrespective of subsequent events.”
Unlike the 2001 infringement complaint, the PTAB’s precedential time-bar decision has now been entirely nullified.
 35 U.S.C. § 315(b)
 Oracle Corp. v. Click-to-Call Technologies LP, IPR2013-00312, Paper 26 at 14 (PTAB Oct. 13, 2013).
 Id at 17.
 Oracle Corp. v. Click-to-Call Technologies LP, Slip Op at 13 (CAFC Aug. 16, 2018).