Can a U.S. provisional patent application be filed in a language other than English?
Yes. A non-provisional or provisional application may be in a language other than English. (2) Provisional application. If a provisional application is filed in a language other than English, an English language translation of the non-English language provisional application will not be required in the provisional application. See ยง 1.78(a) for the requirements for claiming the benefit of such provisional application in a non-provisional application.
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