Rebuttal of Infringement Contention

Rebuttal of infringement contention is an in-depth examination of a claim chart that has been asserted against a product. Sometimes a claim chart is prepared by overlooking elements of the claim clauses, and is mapped on insufficient evidence or incorrect assumptions. The review identifies the technical gaps between the scope of the patent claims and the evidence used in the chart, and gives detailed comments on why that evidence does not align with the claim elements shown.

The target is different. An infringement rebuttal asks whether the accused product meets every element of the claim. An invalidity rebuttal asks whether prior art discloses the claimed invention. One compares claims to a product and the evidence offered about it, the other compares claims to documents with an earlier date. A party under assertion often needs both, but the arguments are separate and rest on different evidence.

Missing elements are the most common. A chart may address most clauses of a claim and pass over one, or treat a limitation as met without pointing to evidence for it. Others come from evidence that is about a different product version, a different mode of operation, or a general description that never shows the specific step claimed. Assumptions are another source, where the chart infers behaviour the cited document does not state.

The claim chart as it was served, the patent it asserts, and the product it accuses. Details of how the accused product actually works matter most, since the rebuttal turns on the difference between the real implementation and what the chart assumes. Specifications, design documents, and the relevant standard release all help. If the assertion concerns a standard essential patent, the version implemented is worth confirming early.