37 CFR 10.89 - Conduct in proceedings.

§ 10.89 Conduct in proceedings.
(a) A practitioner shall not disregard or advise a client to disregard any provision of this Subchapter or a decision of the Office made in the course of a proceeding before the Office, but the practitioner may take appropriate steps in good faith to test the validity of such provision or decision.
(b) In presenting a matter to the Office, a practitioner shall disclose:
(1) Controlling legal authority known to the practitioner to be directly adverse to the position of the client and which is not disclosed by opposing counsel or an employee of the Office.
(2) Unless privileged or irrelevant, the identities of the client the practitioner represents and of the persons who employed the practitioner.
(c) In appearing in a professional capacity before a tribunal, a practitioner shall not:
(1) State or allude to any matter that the practitioner has no reasonable basis to believe is relevant to the case or that will not be supported by admissible evidence.
(2) Ask any question that the practitioner has no reasonable basis to believe is relevant to the case and that is intended to degrade a witness or other person.
(3) Assert the practitioner's personal knowledge of the facts in issue, except when testifying as a witness.
(4) Assert the practitioner's personal opinion as to the justness of a cause, as to the credibility of a witness, as to the culpability of a civil litigant, or as to the guilt or innocence of an accused; but the practitioner may argue, on the practitioner's analysis of the evidence, for any position or conclusion with respect to the matters stated herein.
(5) Engage in undignified or discourteous conduct before the Office (see § 1.3 of the subchapter).
(6) Intentionally or habitually violate any provision of this subchapter or established rule of evidence.
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