Real Party in Interest

Under 35 U.S.C. § 312(a)(2), every IPR petition must identify all real parties in interest (RPI) — the parties who have a direct interest in the outcome of the proceeding and who are backing the petition. LEGAL BASIS: § 312(a)(2) requires the petition to 'identify all real parties in interest'; failure to identify all RPIs makes the petition incomplete; the PTAB will reject an incomplete petition; PURPOSE: the RPI requirement serves several functions: (1) TIMING BAR: under § 315(b), an IPR cannot be filed if the petitioner (or real party in interest or privy of the petitioner) has been served with a complaint alleging infringement more than one year before the petition; undisclosed RPIs may be served on the patent owner's complaint more than one year before the petition, triggering the time bar; (2) ESTOPPEL: under § 315(e)(1) and § 315(e)(2), an IPR petitioner (and its RPIs and privies) is estopped from re-litigating in district court or ITC the grounds raised or reasonably could have been raised in the IPR; undisclosed RPIs may escape estoppel — harming the patent owner; (3) CONFLICT CHECK: RPI disclosure allows the PTAB judges to check for conflicts of interest; DEFINITION: the PTAB has defined RPI as 'a party that has a direct financial interest in the outcome of the proceeding' — including: the petitioner itself; any entity that controls or funds the petition; any entity at whose behest the petition is filed; corporate affiliates who are formal parties to related litigation.

Privity is a separate but related concept under § 315(b) and § 315(e) — a non-party who is in privity with the petitioner is treated as if they were the petitioner for purposes of the one-year bar and post-IPR estoppel: LEGAL STANDARD FOR PRIVITY: the PTAB applies a fact-specific privity analysis derived from common law privity doctrine; key factors include: (1) CONTROL: did the privy have the opportunity to participate in or control the relevant litigation; (2) ALIGNMENT OF INTERESTS: are the privy's legal interests essentially the same as the petitioner's; (3) REPRESENTATION: was the privy adequately represented by the petitioner; (4) VIRTUAL REPRESENTATION: was the prior party the 'virtual representative' of the privy such that there was 'functional identity' between them; TYPICAL PRIVITY RELATIONSHIPS: (1) successor in interest (company that acquired petitioner after an IPR result) — may be in privity; (2) parent and subsidiary companies — case-specific analysis; (3) joint defense agreement parties — may or may not be in privity depending on the agreement's terms; (4) indemnitor/indemnitee — an indemnifying manufacturer may be in privity with the indemnified customer; (5) licensees and patent pools — may be in privity depending on control over litigation decisions; SCOPE OF ESTOPPEL: § 315(e)(1) estoppel applies to grounds 'raised or reasonably could have been raised' in the IPR; privity parties are bound by the estoppel even if they were not named as petitioner; THE KEY QUESTION: was the unnamed party so involved in the petition preparation or the underlying dispute that they should be treated as the petitioner for purposes of the statutory bar and estoppel?

Failure to properly disclose all RPIs can have severe consequences: (1) PETITION REJECTION: an incomplete petition (missing RPI disclosure) is rejected by the PTAB before institution; the defect can be corrected by amendment if caught before institution; (2) TERMINATION AFTER INSTITUTION: if the undisclosed RPI is discovered after institution (e.g., through the patent owner's patent owner preliminary response raising the issue), the PTAB may terminate the proceeding; § 312(a)(2) is a petition REQUIREMENT — failure voids the petition, not just grounds for dismissal; (3) TRIGGERING THE ONE-YEAR BAR: if the undisclosed RPI was served with a complaint alleging infringement more than one year before the petition, the petition is time-barred and must be dismissed; the PTAB has dismissed petitions on this basis even after institution when RPI issues surfaced; (4) EXTENDING ESTOPPEL: the patent owner may argue that the undisclosed RPI is bound by § 315(e) estoppel as a privy, even though they were not disclosed; this is fact-intensive; (5) SANCTIONS: in extreme cases, misrepresenting RPI or deliberately failing to disclose may support sanctions, adverse judgment, or attorney conduct referrals; PRACTICAL CONSEQUENCE: incomplete RPI disclosure is one of the most common reasons IPR petitions are challenged; patent owners routinely investigate petitioners' corporate affiliates and litigation relationships to identify potential undisclosed RPIs; IPR counsel should conduct a thorough affiliate analysis and litigation history review before filing.

The PTAB's analysis of RPI and privity is the most fact-intensive aspect of IPR preliminary proceedings: PTAB'S MULTI-FACTOR RPI TEST (from Applications in Internet Time, LLC v. RPX Corp., PTAB 2014, affirmed): (1) FUNDING: did the party fund the IPR petition? partial funding may suffice; (2) CONTROL OVER PETITION: did the party have control over the decision to file, the grounds selected, or the preparation of the petition? (3) CONTROL OVER PROCEEDINGS: will the party have control over how the IPR is conducted (expert selection, briefing decisions)? (4) WHOSE BEHALF: is the petition filed on the party's behalf even if not explicitly named? CHALLENGING RPI DESIGNATION: patent owners challenge RPI in the POPR (Patent Owner Preliminary Response) or in a separate PTAB motion; patent owners may seek discovery on RPI issues (limited PTAB discovery permitted on RPI challenges); THIRD-PARTY FUNDERS: litigation finance companies present a specific RPI issue — if a funder finances the IPR in exchange for a portion of proceeds, is it an RPI? the PTAB has analyzed this case-by-case; RPX CORP CASE: the Federal Circuit affirmed the PTAB's RPI analysis in Applications in Internet Time — RPX (a patent defense company) was held to be an undisclosed RPI when a member company paid RPX to file the petition on its behalf; the petition was terminated; DEFENSIVE STRATEGIES FOR PETITIONERS: disclose all directly and indirectly interested affiliates upfront; include board members' other affiliations if they could be seen as interested parties; use conservative judgment — it is better to over-disclose than to face a termination motion.

The § 315(b) one-year bar is one of the most important strategic constraints in IPR practice, and its interaction with RPI makes it complex: THE BAR: § 315(b) provides that an IPR 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 CALCULATION: the clock starts from SERVICE of the complaint (not filing); service date must be confirmed — if service was improper, the bar may not start; the one-year period is calculated from the complaint service date; MULTIPLE DEFENDANTS: if multiple defendants are sued together, each defendant's clock starts from when IT was served; if a later-served defendant is the petitioner, its clock starts at its own service date; CUSTOMER-SUIT SCENARIO: a manufacturer is served with a complaint defending a customer; the manufacturer then petitions for IPR — does the customer's service date count? answer depends on whether the customer is an RPI or privy of the manufacturer; in some cases, the manufacturer's indemnification obligation may make the customer a privy for bar purposes; WALLEYE TRADING (Serial IPR Filing): a petitioner who files one IPR within the bar and fails, then files a second IPR within the bar but after institution of the first, may face bar issues depending on the privity of the new petition with the failed one; ESTOPPEL AFTER BAR: § 315(e)(2) estoppel — the RPI/privy CANNOT assert in district court any grounds raised or reasonably could have been raised in the IPR; if the RPI is undisclosed, the scope of estoppel that binds that party later is uncertain and litigation-prone.