Should I ask the patent owner for a claim chart?

What should I ask the sender to identify?

Request the asserted claims, the accused product version, the feature said to satisfy each limitation, and the evidence supporting that comparison. If the sender relies on equivalents rather than literal infringement, ask it to identify that theory expressly.

Why compare individual limitations?

Warner-Jenkinson Co. v. Hilton Davis Chemical Co. requires the doctrine of equivalents to be applied to individual claim elements and prevents it from erasing an element. A product's similar purpose is therefore not an adequate substitute for a supported claim comparison.

What if the sender provides only a broad description?

Identify the missing information in a focused follow-up. Meanwhile, give counsel the patent, product documentation, and relevant samples so the review can proceed. Do not assume a missing chart establishes noninfringement.

Does a chart request extend a response deadline?

Do not assume so. Rule 12(a) governs the response to a served federal complaint, while any court order or agreed extension needs separate review. A private request for more information does not itself amend a court's timetable.