The maintenance of a patent after recognition, must pay annual fees for the planned purpose. Failure to pay annual fees, immediately after the deadline passes patent validity. The holder of a patent liability is to maintain the right to payment of fees.
The amount of annual fees vary depending on the year to be paid as follows:

III - 800,00 denars
IV – 1.000,00
V – 1.200,00
VI – 1.400,00
VII – 1.600,00
VIII – 1.800,00
IX – 2.000,00
X – 3.000,00
XI – 4.000,00
XII– 5.000,00
XIII - 6.000,00
XIV - 7.000,00
XV - 8.000,00
XVI - 9.000,00
XVII - 10.000,00
XVIII - 11.000,00
XIX - 12.000,00
XX - 13.000,00