Final Written Decision

The Final Written Decision (FWD) is the PTAB's definitive judgment in an inter partes review trial: STATUTORY BASIS: 35 U.S.C. § 318(a) requires the PTAB to 'issue a final written decision with respect to the patentability of any patent claim challenged by the petitioner and any new claim added under section 316(d)'; TIMING: the FWD is due within 12 months of the date the trial was instituted; this is a statutory deadline (35 U.S.C. § 316(a)(11)); the PTAB can request and the Director can grant an extension for good cause for up to 6 additional months in complex cases; STRUCTURE OF THE FWD: the FWD typically contains: (1) procedural background (IPR petition, institution decision, trial schedule); (2) claim construction section (how PTAB construes disputed claim terms); (3) analysis of each instituted ground (anticipation or obviousness analysis for each challenged claim on each ground); (4) assessment of patent owner's evidence (expert declarations; secondary considerations); (5) conclusion (which claims are UNPATENTABLE; which SURVIVED); WHAT PTAB DECIDES: CANCELLED CLAIMS: claims that the petitioner has proven UNPATENTABLE by a PREPONDERANCE OF THE EVIDENCE are CANCELLED; SURVIVED CLAIMS: claims that the petitioner failed to prove unpatentable survive the IPR; MIXED OUTCOMES: the FWD often cancels some claims and upholds others; independent claims may survive while dependent claims are cancelled (or vice versa); the PTAB decides each claim separately on each ground; BURDEN OF PROOF: the petitioner bears the burden throughout the trial to prove unpatentability by a PREPONDERANCE OF THE EVIDENCE (more likely than not); EFFECT OF CANCELLATION: cancelled claims are treated as if they were NEVER VALID — they are void from the original issuance date, not merely prospectively invalidated; this means cancelled claims cannot be enforced even for past infringement (though damages already obtained in prior litigation are not automatically refunded).

The timing and outcome of the FWD has significant implications for any parallel district court patent litigation: STAY OF DISTRICT COURT PROCEEDINGS: when an IPR is filed, the accused infringer typically moves to STAY the district court litigation pending the FWD; courts generally evaluate stay motions based on: (1) stage of litigation (earlier = more likely to be stayed); (2) whether the stay will simplify issues (IPR covers many or all challenged claims); (3) whether a stay would unduly prejudice the patent owner; district courts have broad discretion — many courts in patent-active districts (Delaware; WDTX; NDCA) regularly grant stays when IPR is instituted; AFTER THE FWD — CLAIMS CANCELLED: if all claims are cancelled, the district court litigation is typically dismissed as moot; if some claims are cancelled, the case proceeds without those claims; the litigation burden is reduced significantly; AFTER THE FWD — CLAIMS SURVIVED: if key claims survive, litigation resumes with those claims; the petitioner cannot re-litigate the same grounds in district court (estoppel, see below); the patent owner benefits from the FWD's implicit finding that the survived claims are patentable over the asserted art; CLAIM CONSTRUCTION: the PTAB now applies the Philips claim construction standard (same as district courts); PTAB claim constructions are not binding on district courts but are highly persuasive; DISCOVERY OVERLAP: expert declarations submitted in the IPR are often used in district court; the opposing party may depose the IPR experts again in district court; IPR deposition transcripts are used to impeach at district court trial; PARALLEL TRACK STRATEGY: patent owners sometimes use the parallel track strategically — if the patent owner does not file a patent owner response, the PTAB decides based solely on the petition; some patent owners choose not to respond to preserve district court arguments (though this risks FWD on the petition alone).

Petitioner estoppel after an IPR FWD is one of the most significant consequences of the proceeding: STATUTORY BASIS: 35 U.S.C. § 315(e)(2) — after the FWD, the petitioner (and real parties in interest and privies) may NOT assert in a district court or ITC proceeding that a claim is invalid on any ground that the petitioner 'raised or reasonably could have raised during that inter partes review'; SCOPE OF ESTOPPEL: the estoppel covers § 102 and § 103 grounds (the only grounds available in IPR); it does NOT cover § 101 (patentable subject matter) or § 112 (written description, enablement, indefiniteness) — those are NOT grounds for IPR; RAISED OR REASONABLY COULD HAVE RAISED: this phrase is the most litigated aspect of IPR estoppel; it DOES NOT cover: prior art not included in the IPR grounds; prior art that was not reasonably discoverable by a skilled searcher; WHAT IT COVERS: prior art that the petitioner actually raised in the petition; prior art that a skilled searcher conducting a diligent search would have found; REAL PARTIES IN INTEREST AND PRIVIES: estoppel extends beyond the named petitioner to: real parties in interest (those who had control over or funded the IPR); privies (those in privity with the petitioner — including later assignees; related corporate entities); ESTOPPEL APPLIES AFTER FWD: estoppel attaches when the FWD is ISSUED; it does not attach merely from institution of the IPR; if the petitioner settles BEFORE the FWD, the estoppel under § 315(e) does NOT apply (though the IPR is terminated); STRATEGIC IMPLICATION: petitioners should identify ALL relevant prior art BEFORE filing the IPR petition; any ground they leave out of the IPR is a ground they may lose the right to assert in district court after the FWD; IPR AS A ONE-SHOT AT INVALIDITY: petitioners sometimes do NOT file IPR specifically to preserve district court invalidity arguments; the decision to file IPR must weigh the invalidity chance against the estoppel risk; PATENT OWNER ESTOPPEL: the patent owner has NO parallel statutory estoppel from the IPR; patent owners do not lose the right to assert claim construction positions or other arguments in district court that they did not raise at PTAB.

Both the patent owner and petitioner have appeal rights from the PTAB FWD: STATUTORY BASIS: 35 U.S.C. § 319 — 'A party dissatisfied with the final written decision of the Patent Trial and Appeal Board under section 318(a) may appeal the decision pursuant to sections 141 through 144'; DEADLINE: a NOTICE OF APPEAL must be filed within 63 DAYS of the date the FWD is entered; this deadline is jurisdictional — missing it waives the right to appeal; NOTICE OF APPEAL TO WHOM: the notice is filed at BOTH the USPTO (specifically the PTAB) AND the U.S. Court of Appeals for the Federal Circuit; WHAT CAN BE APPEALED: PATENT OWNER: can appeal a finding that any claim is UNPATENTABLE; PETITIONER: can appeal a finding that any claim SURVIVED (is not unpatentable); the petitioner's right to appeal a survival finding was confirmed in Oil States Energy Services v. Greene's Energy Group (S.Ct. 2018) (which also held IPR proceedings constitutional under Article III); WHO CAN APPEAL — ALL PARTIES OR JUST THE PARTIES IN THE IPR: generally, only PARTIES to the IPR can appeal the FWD; third parties who were not parties to the IPR typically cannot appeal; AMICUS PARTICIPATION: amicus briefs at the Federal Circuit are permissible and often filed in high-stakes IPR appeals; STANDARD OF REVIEW AT THE FEDERAL CIRCUIT: LEGAL CONCLUSIONS (claim construction; statutory interpretation): REVIEWED DE NOVO — no deference to PTAB; FACTUAL FINDINGS (what a prior art reference teaches; expert credibility; secondary considerations; POSITA definition): reviewed under SUBSTANTIAL EVIDENCE standard — the Federal Circuit will uphold the PTAB's factual finding if it is supported by substantial evidence in the record, even if the court might have decided differently; OBVIOUSNESS (PTAB CONCLUSION): the ultimate conclusion of obviousness is a LEGAL QUESTION reviewed de novo; but the underlying factual findings (scope of prior art; motivation to combine) are reviewed for substantial evidence; REMAND: if the Federal Circuit finds legal error, it may reverse (decide the question) or remand to the PTAB for further proceedings consistent with the Federal Circuit's ruling.

Several post-FWD options exist before committing to a Federal Circuit appeal: REHEARING PETITION: within 30 DAYS of the FWD, a party can file a Request for Rehearing under 37 C.F.R. § 42.71(d); the standard for rehearing is HIGH: 'the request must specifically identify all matters the party believes the Board misapprehended or overlooked'; PTAB GRANTS REHEARING RARELY: the PTAB grants requests for rehearing in a small percentage of cases; strongest grounds for rehearing: the PTAB failed to address a specific argument made in the briefing; the PTAB made a clear factual error about what a prior art reference discloses; the PTAB's claim construction is internally inconsistent; rehearing is NOT appropriate to simply re-argue the case or to introduce new arguments; STRATEGIC USE OF REHEARING: filing a rehearing petition does NOT toll the appeal deadline; the 63-day appeal deadline runs from the FWD, not the rehearing decision; if the rehearing petition is granted and the PTAB modifies the FWD, the appeal deadline may restart; CERTIFICATE OF CORRECTION: for clerical or typographical errors in the FWD, the PTAB can issue a certificate of correction under 37 C.F.R. § 1.323; not used for substantive changes; LICENSING AND SETTLEMENT IMPLICATIONS: after the FWD, cancelled claims may cause ongoing licenses to become less valuable or void (depending on license terms); patent owners with licenced patents affected by IPR FWDs should review license agreements; CONTINUATION PRACTICE AFTER CANCELLED CLAIMS: cancelled claims can inform what continuation claims to file to replace them; the patent owner may file continuation claims that are NOT invalidated by the IPR prior art (e.g., claims with additional limitations or different scope); new continuation claims filed after an IPR may be subject to IPR estoppel if the petitioner files a new petition; DESIGN-AROUND IMPLICATIONS: if key claims are cancelled, the accused infringer should confirm which substitute claims cover their product and whether any surviving claims do.