Rebuttal of Invalidity Contention for SEPs

Rebuttal of an invalidity contention is a technical review of the prior art that an opposing party has mapped against a standard essential patent, followed by a written response. Each mapping is checked against what the prior art document actually teaches and what the claim limitation actually requires. Where the two do not match, the difference is identified and elaborated in detailed comments and arguments. The findings are documented in an easy-to-read report that the patent owner and its counsel can use.

Two errors recur. The first is a wrong assumption about the technical scope of the prior art, where a document is read as disclosing more than it does, or as disclosing it in a form the claim does not cover. The second is an inappropriate claim of similarity between the evidence and the claim limitations, where a broad resemblance is treated as a match for a specific limitation. Both are exposed by reading the prior art and the claim closely, limitation by limitation.

A validity or invalidity search looks for prior art that could knock out a patent. A rebuttal starts from prior art that someone else has already found and asserted, and tests whether the mapping holds. The work is analytical rather than a search: it compares the technical disclosure of each cited document against the scope of each claim limitation and documents the gaps. Patent owners may need both, one to understand their exposure and the other to answer a contention already made.

The asserted patent and the invalidity contention itself, including the prior art relied on and the charts mapping it to the claims. Prosecution history, earlier claim construction positions and the relevant standard documents are useful too, because the scope of a standard essential patent claim is often argued alongside the standard it is said to cover. Knowing the forum and the deadline helps as well, since both shape how the arguments are set out in the report.