The official language of proceedings before the Portuguese Industrial Property Office (INPI) is Portuguese. However, the application may initially be filed in English. A Portuguese translation thereof must be submitted within one month of the corresponding notification from the Office, provided that an additional fee is paid.   To obtain the filing date, an application should contain at least:

• the applicant's name or company name, address and nationality of the applicant(s) and inventor(s);
• indication of the number, date and country of priority (if any);
• application text (title, description, claims, abstract and drawings) in Portuguese or English.

  Usually, the Portuguese Industrial Property Office (INPI) does not require the filing of the Priority Document. However, under special circumstances, the Office may request a certified copy of the priority document and its translation into Portuguese to be submitted.   The Power of Attorney is not required if the application is filed through a registered Portuguese patent attorney.   Where the applicant is not the inventor, it is sufficient to designate the name and address of the inventor and to state how the applicant acquired the right to the patent. No Assignment Deed is required.