37 CFR §11.306

1. (a)A practitioner who is participating or has participated in the investigation or litigation of a matter shall not make an extrajudicial statement that the practitioner knows or reasonably should know will be disseminated by means of public communication and will have a substantial likelihood of materially prejudicing an adjudicative proceeding in the matter.
2. (b)Notwithstanding paragraph (a) of this section, a practitioner may state:
   1. (1)The claim, offense or defense involved and, except when prohibited by law, the identity of the persons involved;
   2. (2)Information contained in a public record;
   3. (3)That an investigation of a matter is in progress;
   4. (4)The scheduling or result of any step in litigation;
   5. (5)A request for assistance in obtaining evidence and information necessary thereto; and
   6. (6)A warning of danger concerning the behavior of a person involved, when there is reason to believe that there exists the likelihood of substantial harm to an individual or to the public interest.
3. (c)Notwithstanding paragraph (a) of this section, a practitioner may make a statement that a reasonable practitioner would believe is required to protect a client from the substantial undue prejudicial effect of recent publicity not initiated by the practitioner or the practitioner's client. A statement made pursuant to this paragraph shall be limited to such information as is necessary to mitigate the recent adverse publicity.
4. (d)No practitioner associated in a firm or government agency with a practitioner subject to paragraph (a) of this section shall make a statement prohibited by paragraph (a).