The official language of a patent registration in India is English or Hindi. It is possible to file an application in a foreign language and to submit translation within three months as of the invitation by Indian IP Office. However, it is highly recommended to submit translation at the time of filing. To obtain the date of filing, a patent application in India should contain: - complete specification including description, claims, abstract and drawings in English or Hindi; - details of the applicant(s) and inventor(s), i.e. name, nationality and complete address(es); - details of the priority claim: date, application number and country. If the Priority Document is not in English, the deadline for submission of the English translation of the priority document is likewise 12 months from the earliest priority date claimed. Where the priority document (and its English translation, if applicable) is not submitted within the time limit of 12 months, it shall be submitted within three months from the date of invitation received from the Indian Patent Office. A scanned copy of the Power of Attorney can be submitted within 3 months from the filing date, however, the original should be submitted within 15 days from receiving corresponding notification from the Office, if requested. Legalisation or notarization of the Power of Attorney is not required. If the applicant is not the inventor, a scanned copy of the Declaration of Inventorship (Assignment Deed) should be provided within six months from the date of filing a patent application in India. The original may be requested by the Office and submitted within 15 days from the corresponding notification. The legalisation or notarization is not required.