Correspondence must be in English.
37 C.F.R. § 7.3
in effectEffective: 2024-07-01International applications and registrations, requests for extension of protection and all other related correspondence with the Office must be in English. The Office will not process correspondence that is in a language other than English.
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-37.xmlFetched: 7/26/2026
