Loc. Pat. R. 4.3 — Exchange of Preliminary Claim Constructions and Extrinsic Evidence
A published court requirement that applies in New York. Category: Local Rules. Effective January 1, 2024. Verified against the official source (W.D.N.Y. — Rules: Individual, Local & Federal (U.S. District Court, Western District of New York)) on November 3, 2026.
Summary
Loc. Pat. R. 4.3 — Exchange of Preliminary Claim Constructions and Extrinsic Evidence: the court's own rule, verbatim from the Local Patent Rules, United States District Court for the Western District of New York, effective January 1, 2024 (official PDF, sha-custodied). Court-level requirement: applies in every patent case before the U.S. District Court for the Western District of New York, alongside the Local Rules of Civil Procedure and any judge-specific procedures.
Requirement
(a) Not later than twenty-one (21) days after the exchange of lists pursuant to Loc. Pat. R. 4.2, the parties shall simultaneously exchange preliminary proposed constructions of each term identified by any party for claim construction. Each such “Preliminary Claim Construction” shall also, for each term which any party contends is governed by 35 U.S.C. § 112 ¶ 6, identify the structure(s), act(s), or material(s) corresponding to that term’s function. (b) At the same time the parties exchange their respective “Preliminary Claim Constructions”, each party shall also identify all references from the specification or prosecution history that support its preliminary proposed construction and designate any supporting extrinsic evidence including, without limitation, dictionary definitions, citations to learned treatises and prior art, and testimony of all witnesses including expert witnesses. Extrinsic evidence shall be identified by production number or by producing a copy if not previously produced. With respect to all witnesses including experts, the identifying party shall also provide a description of the substance of that witness’ proposed testimony that includes a listing of any opinions to be rendered in connection with claim construction. (c) The parties shall thereafter meet and confer for the purposes of narrowing the issues and finalizing preparation of a “Joint Claim Construction and Prehearing Statement.”
Source of truth
(a) Not later than twenty-one (21) days after the exchange of lists pursuant to Loc. Pat. R. 4.2, the parties shall simultaneously exchange preliminary proposed constructions of each term identified by any party for claim construction. Each such “Preliminary Claim Construction”
- Official source
- W.D.N.Y. — Rules: Individual, Local & Federal (U.S. District Court, Western District of New York)
- Source health
- Healthy · checked November 14, 2026
- Effective date
- January 1, 2024
- Last verified
- November 3, 2026benchpath-nyfed-rules-2026-11-03
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