Broadest Reasonable Interpretation

The broadest reasonable interpretation (BRI) standard is the USPTO's traditional standard for construing patent claims during patent examination and certain PTAB proceedings: DEFINITION: under BRI, claim terms are given their BROADEST MEANING that is REASONABLE in light of the specification; claim language is not limited to the preferred embodiments disclosed in the specification; ordinary meaning is assigned unless the applicant clearly acts as their own lexicographer or disclaims certain scope; RATIONALE: the USPTO uses BRI to promote precision in patent claim drafting; if claims are construed broadly during prosecution, applicants are motivated to claim precisely what they actually invented and to amend claims to narrower scope when rejections are issued; BRI also promotes public notice — overly broad claims issued under a narrow construction at the USPTO would surprise competitors and users of the patent record; WHEN BRI APPLIES: (1) PATENT EXAMINATION: examiners apply BRI to pending claims during initial examination and all stages of prosecution before allowance; (2) PRE-AIA INTER PARTES REEXAMINATION: BRI applied; (3) EX PARTE REEXAMINATION: BRI applies; (4) PTAB TRIALS (TRANSITIONAL): BRI applied in IPR, PGR, and CBM proceedings for patents that issued before the PTAB rules changed in 2018; CURRENT STATUS: the USPTO changed its rules in November 2018 — PTAB trial proceedings (IPR, PGR) now apply the SAME CLAIM CONSTRUCTION STANDARD AS FEDERAL COURT (Phillips standard), not BRI; ex parte examination still uses BRI.

The BRI and Phillips standards often reach the same result, but differ in important ways: BRI FEATURES: (1) BROADEST REASONABLE = start with widest plausible reading; when in doubt, read broadly; (2) ORDINARY MEANING: ordinary meaning of claim terms in the relevant art, not limited to preferred embodiments; (3) SPECIFICATION IS A LIMIT, NOT A DEFINITION: specification prevents unreasonably broad readings, but does not limit claims to disclosed embodiments; (4) NO EXTRINSIC EVIDENCE REQUIRED: BRI analysis focuses on the claim language + specification (intrinsic evidence); PHILLIPS STANDARD (Federal Circuit, 2005): (1) CLAIMS MEAN WHAT THEY SAY: claim terms are given their ordinary and customary meaning to a person of ordinary skill in the art at the time of the invention; (2) CONTEXT OF ENTIRE PATENT: entire patent document (other claims, specification, prosecution history) is the primary interpretive tool; (3) SPECIFICATION AS WRITTEN DESCRIPTION: if the specification consistently uses a term in a specialized way, that specialized meaning applies; but specification embodiments should not be imported into the claims unless the specification clearly limits the claim scope; (4) EXTRINSIC EVIDENCE (dictionaries, expert testimony) used to resolve ambiguity after intrinsic sources are exhausted; KEY DIFFERENCE IN PRACTICE: BRI may read a claim more broadly than Phillips would because under BRI, the claim is given its broadest possible reading that is still reasonable; under Phillips, the claim is given the reading a skilled artisan would most naturally adopt given all intrinsic evidence.

BRI has significant implications for how applicants draft claims and respond to USPTO rejections: BROADER REJECTIONS: because examiners use BRI, they often construe claims more broadly than the applicant intends — finding prior art that covers the broadest reading of the claim; applicants must argue against the broad construction OR amend to add limitations that distinguish even the broadest reading; APPLICANT AS LEXICOGRAPHER: under BRI, applicants can control claim scope by acting as their own lexicographer — explicitly defining terms in the specification to narrow the broadest reasonable meaning; this definition binds both the USPTO (BRI) and federal courts (Phillips); PROSECUTION HISTORY ESTOPPEL: arguments made to overcome BRI-based rejections can create prosecution history estoppel that limits claim scope in federal court; if an applicant argues 'my claim term X means Y (not Z) to overcome the prior art,' this argument narrows the claim even at the Phillips standard in litigation; DRAFTING STRATEGY UNDER BRI: (1) USE CLEAR DEFINITIONS: define terms in the specification to prevent overbroad or unwanted BRI constructions; (2) AVOID FUNCTIONAL LANGUAGE WITHOUT STRUCTURE: under BRI, functional language is read broadly; means-plus-function claims under § 112(f) are read under the Phillips standard even during prosecution; (3) ANTICIPATE EXAMINER'S BROAD READING: draft claims assuming the examiner will read them as broadly as possible; then add alternative claim sets at different scope levels; (4) ARGUE CONSTRUCTION IN RESPONSE: applicants can and should argue the proper claim construction to the examiner — the proper BRI should be informed by the specification; an examiner who ignores the specification is applying BRI improperly.

The November 2018 rule change aligning IPR/PGR with the Phillips standard addressed a fundamental inconsistency: THE PROBLEM WITH BRI IN PTAB TRIALS: a patent claim construed broadly at the PTAB (BRI) might be construed narrowly in federal court (Phillips); the same patent could be INVALID at the PTAB (because under BRI, the broad claim was anticipated) while INFRINGED in federal court (because under Phillips, the narrow claim is infringed by the accused product); this asymmetry created a 'heads I win, tails you lose' dynamic for patent owners AND for defendants; Cuozzo Speed Technologies v. Lee (S.Ct. 2016): the Supreme Court upheld the USPTO's authority to use BRI in IPR proceedings — but this ruling preceded the 2018 rule change; SAS INSTITUTE INC. v. IANCU (S.Ct. 2018): the PTAB must address all grounds of unpatentability raised in the petition; also influenced uniformity concerns; POLICY REASONS FOR CHANGE: (1) CONSISTENCY: when a patent is challenged in both PTAB and district court, the same claim should not have different meanings in each forum; (2) REDUCING MANIPULATION: if defendants could get broad BRI constructions at PTAB to invalidate and narrow Phillips constructions in court for infringement, the patent system's coherence was undermined; (3) ALIGNMENT WITH LITIGATION: because IPR final written decisions are reviewed by the Federal Circuit under Phillips, using BRI at PTAB created appellate tension; CURRENT STATE: IPR and PGR use Phillips; ex parte examination still uses BRI; ex parte reexamination still uses BRI.

Review of BRI claim constructions from USPTO proceedings depends on the posture: EXAMINATION AND PROSECUTION: USPTO examiner BRI constructions are reviewed by the PTAB on appeal (ex parte appeal); PTAB decisions on BRI constructions are reviewed by the Federal Circuit; the Federal Circuit reviews legal questions de novo (no deference) but deferential review (substantial evidence) for factual determinations; IN RE CUOZZO SPEED TECHNOLOGIES (Fed. Cir. 2016, then S.Ct. 2016): BRI in PTAB IPR proceedings was upheld as reasonable interpretation of the statute; the Court deferred to the USPTO's authority to choose a claim construction standard; POST-2018 IPR: now that IPR uses Phillips, the Federal Circuit reviews PTAB claim constructions under a no-deference standard for legal conclusions (same as in district courts); factual findings underlying claim construction (e.g., expert testimony about the skilled artisan's understanding) are reviewed for substantial evidence; DISTRICT COURT COLLATERAL ESTOPPEL: if a BRI-based claim construction resulted in a patent being invalidated at the PTAB, there may be estoppel effects in subsequent district court litigation; however, different standards mean a claim construed broadly under BRI and invalidated might not be estoppel-barred under the narrower Phillips construction; PRACTICAL TIP: when preparing IPR petitions (post-2018), the petitioner should argue both the claim construction AND why the claim is unpatentable under that construction — the Phillips standard means the constructions directly inform what the claim means in parallel district court litigation.