Claims Construction

Claim construction is the interpretive process by which courts determine the meaning of patent claim terms: DEFINITION: claim construction (also called 'claims construction' or 'patent claim interpretation') is the judicial process of determining the meaning and scope of the language in patent claims; WHY IT IS THE PIVOTAL ISSUE IN PATENT CASES: infringement: whether the accused product infringes depends entirely on how the claims are construed — a broad construction increases the likelihood of infringement; a narrow construction may exclude the accused product; invalidity: whether prior art anticipates a claim depends on claim construction — a broad claim is more likely to be anticipated; a narrow claim may avoid the prior art; LEGAL STANDARD: claim construction is a question of law (not fact); the judge — not the jury — decides claim construction; the Federal Circuit reviews claim construction de novo (fresh review on appeal — no deference to the trial court's legal conclusions); TEVA PHARMACEUTICALS v. SANDOZ (S.Ct. 2015): underlying factual determinations (e.g., the meaning of a technical term to a POSITA at the time of invention) are reviewed for clear error (deferential standard); legal conclusions from those facts are reviewed de novo; MARKMAN HEARINGS: Markman v. Westview Instruments (S.Ct. 1996): held that claim construction is a question of law for the judge (not the jury); in practice: most federal courts hold a 'Markman hearing' (also called a 'claim construction hearing') where both parties present arguments; the judge issues a 'Markman order' setting forth the construction of disputed claim terms; IMPACT ON SETTLEMENT: claim construction often determines the outcome of the entire case; narrow construction → defendant moves for summary judgment of non-infringement; broad construction → plaintiff strengthens infringement case; most cases settle shortly after a Markman order.

Phillips v. AWH Corp. (Fed. Cir. 2005 en banc) established the controlling framework for claim construction: HOLDING: the Federal Circuit sitting en banc (all active judges) affirmed the 'intrinsic-first' approach to claim construction; INTRINSIC EVIDENCE (primary): claim construction starts with intrinsic evidence — evidence generated during prosecution and contained in the patent itself; TIER 1 — THE CLAIMS THEMSELVES: claims are construed in the context of the entire patent; terms in one claim can inform the meaning of the same term in another claim; if a term is used the same way in claim 1 and claim 10, they likely have the same meaning; TIER 2 — THE SPECIFICATION: the specification is 'the single best guide to the meaning of a disputed term'; the 'LEXICOGRAPHER RULE': if the patentee explicitly defines a claim term in the specification, that definition controls — even if it differs from the ordinary meaning; the 'DISAVOWAL RULE': if the specification clearly disclaimed a certain meaning or scope, that disclaimer limits the claim; IMPORTANT LIMIT: specific embodiments described in the specification do NOT limit the claims — unless the specification clearly indicates the embodiments are limiting; TIER 3 — PROSECUTION HISTORY: the prosecution history is intrinsic evidence but is given less weight than the specification; PROSECUTION HISTORY DISCLAIMER: clear and unmistakable statements made to the USPTO to distinguish prior art are binding; if the applicant argued that the claim does NOT cover feature X to overcome a rejection, the claim cannot later be construed to cover feature X; EXTRINSIC EVIDENCE (secondary): dictionaries; technical treatises; expert testimony; can help explain the technical background; CANNOT override clear intrinsic evidence; ORDINARY MEANING: when no special definition or disavowal exists, claim terms are given their ORDINARY AND CUSTOMARY MEANING — the meaning that a POSITA would have given the term at the time of the invention.

Prosecution history creates important limitations on claim scope: PROSECUTION HISTORY DISCLAIMER: when a patent applicant makes clear and unmistakable arguments or amendments to the USPTO to distinguish prior art, those statements can limit the claim's scope in litigation; LEGAL BASIS: a patent owner cannot reclaim subject matter it deliberately surrendered during prosecution (cannot 'blow hot and cold'); THREE TYPES OF PROSECUTION HISTORY ESTOPPEL/DISCLAIMER: (1) ARGUMENT-BASED DISCLAIMER: arguments made to distinguish a reference can limit claim scope; requirement: the disclaimer must be 'clear and unmistakable'; ambiguous statements do not create disclaimer; (2) AMENDMENT-BASED ESTOPPEL: amendments made to narrow claim scope to overcome prior art create prosecution history estoppel (PHE); PHE limits the doctrine of equivalents for the surrendered subject matter; Festo Corp. v. Shoketsu (S.Ct. 2002): PHE creates a REBUTTABLE PRESUMPTION that all subject matter between the original and narrowed claim is surrendered; the patent owner can rebut by showing the equivalent was not foreseeable or tangentially related to the reason for the amendment; (3) CAPITULATION DISTINCTION: not every amendment creates disclaimer; capitulation to examiner (where the applicant amended without clear indication of why) may create less or no disclaimer; PRACTICAL EXAMPLES: applicant argued that claim 1 does not cover 'wireless' methods → claim construction may exclude wireless implementations; applicant amended 'device' to 'portable device' to overcome prior art → claim is limited to portable devices (not desktops); WHO REVIEWS THE PROSECUTION HISTORY: both parties' claim construction experts review the entire file wrapper (all prosecution history documents) for disclaimers and statements that affect scope; LOCAL PATENT RULES: local patent rules in most districts require early disclosure of claim constructions and supporting evidence, including prosecution history citations; TIPS FOR PATENT PROSECUTORS: avoid overly narrow arguments during prosecution; frame distinguishing arguments broadly; if possible, amend only dependent claims and maintain independent claims; use interview statements carefully (documented in PTOL-474).

Certain claim construction issues arise repeatedly in patent litigation: DISPUTE 1 — ORDINARY MEANING vs. SPECIALIZED TECHNICAL MEANING: technical terms sometimes have meanings in the field that differ from general dictionary definitions; resolution: use extrinsic evidence (expert testimony; technical dictionaries; treatises) to establish the technical meaning; the POSITA standard establishes whose meaning matters; DISPUTE 2 — PREAMBLE LIMITING vs. NON-LIMITING: when does the preamble of a claim limit the claim's scope?; the preamble is LIMITING when: it gives 'life and meaning' to the claim (the body's elements depend on the preamble); the applicant clearly relied on the preamble to establish patentability; it recites essential structure for the invention; the preamble is NON-LIMITING when: it merely states the intended purpose or use; the body of the claim is complete and self-contained without the preamble; DISPUTE 3 — MEANS-PLUS-FUNCTION SCOPE (§ 112(f)): 'means for [function]' language is construed to cover only the corresponding structure described in the specification and its structural equivalents; broader structure in the specification = broader claim; narrow structure in the specification = very narrow claim; DISPUTE 4 — FUNCTIONAL CLAIM LANGUAGE: 'configured to'; 'adapted to'; 'capable of' are structural limitations (the device must have the structural capability, not just the theoretical ability); 'for' language in an apparatus claim usually is a functional limitation requiring that structural capability; DISPUTE 5 — NUMERICAL RANGES: 'about 100' — how far does 'about' extend?; resolution: look to the specification for guidance; look at the precision of the measurement; the purpose for which the range was claimed; CLAIM DIFFERENTIATION DISPUTES: when does a dependent claim's limitation restrict the independent claim's scope?; the principle: dependent claims are presumed to have a different scope than the claims they depend from; the independent claim is presumed to NOT require the element added by the dependent claim; DISPUTE 6 — TERMS OF DEGREE: 'substantially'; 'approximately'; 'essentially'; are these indefinite or construable?; Nautilus (S.Ct. 2014) 'reasonable certainty' standard; terms of degree with objective anchoring in the specification are construable.

Markman hearings are the formal procedure for claim construction in district court: LEGAL FOUNDATION: Markman v. Westview Instruments, Inc. (S.Ct. 1996): the Supreme Court unanimously held that claim construction is a question of law for the judge, not the jury; TIMING: most courts conduct the Markman hearing after discovery of claim construction materials (patents, prosecution histories, expert declarations) but before fact/expert discovery for infringement and invalidity; Local Patent Rules in most districts (NDCA, WDTX, DDel, etc.) specify a timeline for: disclosure of claim terms in dispute; simultaneous exchange of proposed constructions; simultaneous exchange of supporting evidence; simultaneous opening briefs; simultaneous response briefs; Markman hearing; Markman order; TYPICAL MARKMAN HEARING FORMAT: opening argument by plaintiff (2-4 hours); opening argument by defendant (2-4 hours); judge-specific format varies widely; some judges allow technical tutorials; some use technical special masters; some conduct tutorial and hearing in one session; JUDGE'S MARKMAN ORDER: specifies construction of each disputed claim term; sets the meaning that will be used throughout the trial; binding on both parties at trial; IMPACT: if the judge's construction of a disputed term is dispositive on infringement or validity, often triggers: motions for summary judgment of non-infringement (defendant wins if no infringement possible under the construction); motions for summary judgment of invalidity (defendant wins if prior art clearly covers the claim under the construction); STATISTICS: approximately 30-35% of appealed claim constructions are reversed by the Federal Circuit (de novo review); the high reversal rate creates uncertainty and encourages settlement at Markman stage; POST-MARKMAN SETTLEMENT: most patent cases settle within 90-180 days of the Markman order — the order makes the litigation's likely outcome much clearer for both sides.