39 C.F.R. § 221.7 Postal Service emblem.
Title 39 - Postal Service
The Postal Service emblem, which is identical with the seal, is registered as a trademark and service mark by the U.S. Patent Office. Except for the emblem on official stationery, the emblem must bear one of the following notations: “Reg. U.S. Pat. Off.”, “Registered in U.S. Patent Office”, or the letter R enclosed within a circle.
Title 39: Postal Service
PART 221—GENERAL ORGANIZATION
§ 221.7 Postal Service emblem.
