THE PATENTS RULES, 2003
Rule 21

Filing of priority document

(1) Where the applicant in respect of an international application designating India has not complied with the requirements of paragraph (a) or paragraph (b) of rule 17.1 of the regulations under the Treaty, the applicant shall file with the patent office the priority document referred to in that rule before the expiration of the time limit referred to in sub-rule (4) of rule 20.

(2) Where priority document referred to in sub-rule (1) is not in the English language, an English translation thereof duly verified by the applicant or the person duly authorised by him shall be filed within the time limit specified in sub-rule (4) of rule 20.

(3) Where the applicant does not comply with the requirements of sub-rule (1) or sub-rule (2), the appropriate office shall invite the applicant to file the priority document or the translation thereof, as the case may be, within three months from the date of such invitation, and if the applicant fails to do so, the claim of the applicant for the priority shall be disregarded for the purposes of the Act.