This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.
No, an English translation of a non-English language foreign application is not always required. According to 37 CFR 1.55(g)(3), an English language translation is only required in specific circumstances:
An English language translation of a non-English language foreign application is not required except: (i) When the application is involved in an interference (see § 41.202 of this chapter) or derivation (see part 42 of this chapter) proceeding; (ii) When necessary to overcome the date of a reference relied upon by the examiner; or (iii) When specifically required by the examiner.
If a translation is required, it must be filed together with a statement that the translation of the certified copy is accurate.