37 CFR § 42.405 - Content of petition.
(a) Grounds for standing. The petition must:
(1) Demonstrate compliance with §§ 42.402 and 42.403; and
(2) Show that the petitioner has at least one claim that is:
(2) Demonstrate that a claimed invention was derived from an inventor named in the petitioner's application, and that the inventor from whom the invention was derived did not authorize the filing of the earliest application claiming such invention; and
(3) For each of the respondent's claims to the derived invention,
(ii) Identify how the claim is to be construed. Where the claim to be construed contains a means-plus-function or step-plus-function limitation as permitted under 35 U.S.C. 112(f), the construction of the claim must identify the specific portions of the specification that describe the structure, material, or acts corresponding to each claimed function.
(c) Sufficiency of showing. A derivation showing is not sufficient unless it is supported by substantial evidence, including at least one affidavit addressing communication of the derived invention and lack of authorization that, if unrebutted, would support a determination of derivation. The showing of communication must be corroborated.