37 CFR 10.34 - Communication of fields of practice.
A registered practitioner may state or imply that the practitioner is a specialist as follows:
(a) A registered practitioner who is an attorney may use the designation “Patents,” “Patent Attorney,” “Patent Lawyer,” “Registered Patent Attorney,” or a substantially similar designation.
(b) A registered practitioner who is not an attorney may use the designation “Patents,” “Patent Agent,” “Registered Patent Agent,” or a substantially similar designation, except that any practitioner who was registered prior to November 15, 1938, may refer to himself or herself as a “patent attorney.”
Title 37 published on 2013-07-01
no entries appear in the Federal Register after this date.