37 C.F.R. § 3.26 English language requirement.
Title 37 - Patents, Trademarks, and Copyrights
The Office will accept and record non-English language documents only if accompanied by an English translation signed by the individual making the translation. [62 FR 53202, Oct. 10, 1997]
Title 37: Patents, Trademarks, and Copyrights
PART 3—ASSIGNMENT, RECORDING AND RIGHTS OF ASSIGNEE
Requirements for Recording
§ 3.26 English language requirement.

