# Compare Claim Constructions Patent Spec > Claim construction analysis memorandum evaluating proposed constructions for disputed patent terms against the patent specification, prosecution history, and opposing brief, prepared from the client's perspective. - Skill: `finchipaiorg/compare-claim-constructions-patent-spec` (Agent Skill) - Install (CLI): `npx skillmds@latest add finchipaiorg/compare-claim-constructions-patent-spec` - Raw SKILL.md: https://api.skillmd.com/api/skills/finchipaiorg/compare-claim-constructions-patent-spec/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: FinchipAIOrg (https://skillmd.com/u/finchipaiorg) - Updated: 2026-09-22 - Page: https://skillmd.com/skills/finchipaiorg/compare-claim-constructions-patent-spec --- # Skill: Compare Proposed Claim Constructions Against Patent Specification ## 1. Subject-matter triage - Treat this as a term-by-term claim-construction comparison memo, not a generic patent summary. - Identify every disputed term surfaced in the claim materials and opposing brief before analyzing any single term. - If the materials implicate more than one claim, limitation, embodiment, or prosecution event, separate them by term and by claim context so scope arguments do not bleed across limitations. - If a term appears only once in the intrinsic record, say so; if it appears in multiple claims or related passages, analyze each usage before choosing a recommended construction. ## 2. Failure modes the skill is correcting - Reading the opposing proposal in isolation instead of anchoring the analysis in the claim language and intrinsic record. - Treating the patent specification as background only, rather than the primary guide to meaning. - Accepting an expert declaration as though it were controlling, instead of using it only to the extent it aligns with intrinsic evidence. - Overlooking prosecution statements that narrow, clarify, or disclaim scope. - Missing claim-differentiation arguments where one proposed construction would collapse distinctions among claims. - Failing to test whether the competing construction would make words redundant, superfluous, or inconsistent across related claims. - Using conclusory assertion instead of showing how the intrinsic record supports the client’s construction and defeats the opponent’s. ## 3. Legal frameworks / domain conventions that apply - Apply the governing claim-construction framework for the forum: start with the claim text, then read the surrounding claims, then the specification, then the prosecution history, and only then consider extrinsic materials such as expert testimony or dictionaries. - Give the specification primary interpretive weight; use quoted or paraphrased passages from the intrinsic record to show how the term is used in context. - Use claim differentiation as a default inference, while checking whether the specification or prosecution history rebuts that inference. - Treat prosecution history as intrinsic evidence that can limit scope when the patentee distinguished prior art, amended claims, or otherwise surrendered meaning. - Treat expert declarations, treatises, and dictionaries as confirmatory, not controlling, where they conflict with intrinsic sources. - When the term is a familiar art term, explain ordinary meaning in context, but test that meaning against the patent’s own definitional or exemplary usage. - Cite the controlling authority for each legal proposition you rely on, including the claim-construction framework, the role of intrinsic evidence, claim differentiation, prosecution disclaimer, and the limited role of extrinsic evidence. ## 4. Analytical scaffolds - Begin with a disputed-term inventory. Number each term and preserve the order in which it appears in the claim-construction materials. - For each term, run the same sequence: - State the client’s proposed construction and the opposing proposed construction. - Identify the controlling claim language and the exact claim context in which the term appears. - Compare the term against related claim language to test consistency and differentiation. - Walk the specification for passages that define, exemplify, or limit the term. - Review prosecution history for amendments, arguments, or disclaimers that bear on scope. - Address the opposing expert’s position only after the intrinsic record has been analyzed. - Conclude with the construction the court should adopt and the shortest reason that supports it. - If a term is not expressly defined in the specification, note that fact and explain whether ordinary meaning, contextual usage, or intrinsic inferential limits control. - If the record contains competing embodiments or examples, explain whether the term should be read broadly enough to cover each embodiment or narrowly enough to preserve the patent’s stated distinction. - If a proposed construction would introduce surplusage, contradictions, or internal inconsistency, say where that occurs and why it matters. - For every issue, close the analysis by tying the construction dispute to the concrete source text, the cross-referenced claim or prosecution material, and the practical effect on infringement, validity, or claim scope. ## 5. Vertical / structural / temporal relationships - Track relationships among independent claims, dependent claims, and alternative claim groups; use those relationships to test whether one proposed construction improperly imports a limitation or erases a narrowing clause. - Track relationships among specification passages, embodiments, and definitional statements; do not elevate a preferred embodiment unless the record compels it. - Track relationships across prosecution events over time; later amendments or arguments may confirm earlier meaning or narrow previously broader language. - When one term is reused across claims, assume consistent meaning unless the record shows a reason to depart. - When two terms are paired in the claim language, analyze whether the opponent’s construction breaks that pairing or makes one term do no work. ## 6. Output structure conventions - Write a legal memorandum with a concise standard-of-construction section, a term-by-term analysis section, and a short conclusion. - Organize the body by disputed term, not by source document. - For each term, include: - disputed term - client position - opponent position - intrinsic record analysis - prosecution history analysis - treatment of any expert declaration - recommended construction - Use brief citations to the patent record and governing authority in-line where each point is made. - Keep the tone client-forward but analytically disciplined; advocate for the client’s construction without overstating what the intrinsic record supports. - If a term requires reliance on ordinary meaning, say so expressly and explain why the intrinsic record does not supply a narrower or broader meaning. - End with a short recommendation section that identifies the constructions most defensible on the present record and any terms that warrant further factual development.