What should I request again?
Ask for the specific claims, accused product versions, and the features the sender says meet each limitation. Make the request narrow enough that the missing information is clear. Avoid turning the exchange into unsupported accusations about the sender's motives.
Can I analyze the claim without their chart?
Counsel can begin with the issued patent and the actual product record. For utility-patent equivalents, Warner-Jenkinson Co. v. Hilton Davis Chemical Co. requires an element-by-element analysis. Identify the factual and claim-construction questions that prevent a confident conclusion.
Does their refusal defeat a later lawsuit?
Do not assume that result. The record and applicable pleading, discovery, and local patent rules must be reviewed in the actual case. This page does not assert a universal duty to provide a pre-suit chart.
What should I do about deadlines?
Determine whether you have only a private letter or have also received a complaint, subpoena, platform notice, or order. Rule 12(a) sets federal pleading-response periods subject to its exceptions. Continue the needed investigation while counsel addresses any formal response or extension.