37 CFR § 11.504 - Professional independence of a practitioner.
(a) A practitioner or law firm shall not share legal fees with a non-practitioner, except that:
(1) An agreement by a practitioner with the practitioner's firm, partner, or associate may provide for the payment of money, over a reasonable period of time after the practitioner's death, to the practitioner's estate or to one or more specified persons;
(2) A practitioner who purchases the practice of a deceased, disabled, or disappeared practitioner may, pursuant to the provisions of § 11.117, pay to the estate or other representative of that practitioner the agreed-upon purchase price;
(3) A practitioner or law firm may include non-practitioner employees in a compensation or retirement plan, even though the plan is based in whole or in part on a profit-sharing arrangement; and
(4) A practitioner may share legal fees, whether awarded by a tribunal or received in settlement of a matter, with a nonprofit organization that employed, retained or recommended employment of the practitioner in the matter and that qualifies under Section 501(c)(3) of the Internal Revenue Code.
(b) A practitioner shall not form a partnership with a non-practitioner if any of the activities of the partnership consist of the practice of law.
(c) A practitioner shall not permit a person who recommends, employs, or pays the practitioner to render legal services for another to direct or regulate the practitioner's professional judgment in rendering such legal services.
(d) A practitioner shall not practice with or in the form of a professional corporation or association authorized to practice law for a profit, if:
(1) A non-practitioner owns any interest therein, except that a fiduciary representative of the estate of a practitioner may hold the stock or interest of the practitioner for a reasonable time during administration;
(2) A non-practitioner is a corporate director or officer thereof or occupies the position of similar responsibility in any form of association other than a corporation; or
(3) A non-practitioner has the right to direct or control the professional judgment of a practitioner.
(e) The prohibitions of paragraph (a), (b), or (d)(1) or (2) of this section shall not apply to an arrangement that fully complies with the laws, rules, and regulations of the attorney licensing authority of the State(s) that affirmatively regulate(s) such arrangement.