§2.119 Service and signing of papers.
(a)Every paper filed in the Patent and Trademark Office in inter partes cases, including notice of appeal, must be served upon the other parties except the notice of interference (§ 2.93), the notification of opposition (§ 2.105), the petition for cancellation (§ 2.113), and the notice of a concurrent use proceeding (§ 2.99), which are mailed by the Patent and Trademark Office. Proof of such service must be made before the paper will be considered by the Office. A statement signed by the attorney or other authorized representative, attached to or appearing on the original paper when filed, clearly stating the date and manner in which service was made will be accepted as prima facie proof of service.
(b)Service of papers must be on the attorney or other authorized representative of the party if there be such or on the party if there is no attorney or other authorized representative, and may be made in any of the following ways:
(1)By delivering a copy of the paper to the person served;
(2)By leaving a copy at the usual place of business of the person served, with someone in the person's employment;
(3)When the person served has no usual place of business, by leaving a copy at the person's residence, with a member of the person's family over 14 years of age and of discretion;
(4)Transmission by the "Express Mail Post Office to Addressee" service of the United States Postal Service or by first-class mail, which may also be certified or registered;
(5)Transmission by overnight courier.
Whenever it shall be satisfactorily shown to the Director that none of the above modes of obtaining service or serving the paper is practicable, service may be by notice published in the Official Gazette.