1. A simply signed Power of Attorney.
   
   
2. The name and address of the applicant and the inventor.
   
   
3. The specification, claims, abstract and drawings, if any.
   
   
4. A priority document, if priority is to be claimed.

Annuity Payment for Patents

A patent is valid for 20 years from the application filing date in Latvia, or 20 years from the PCT filing date. European patents extended to Lithuania and Latvia are valid for 20 years from the EP filing date.

A patent annuity must be paid each year to the patent office for maintaining the patent in force for the following year. The annuity must be paid within 2 months prior to the patent annuity due date or within 6 months after the annuity due date with a higher fee.


Requirements for Payment Annuities