Mere payment of the renewal fee at the patent office is not sufficient to enable the maintenance of the patent. It is vital to ensure that the payment is made with the correct details to avoid either of the two scenarios:
a. Patents becoming lapse; or
b. Payments being made twice over during the same year.
The payment of annuity fee in India is to be made at the appropriate office where the patent was granted. This can be identified if the applicant has the correct application number that contains the abbreviation for the respective zonal office. Since, the Patent administration system in India has four branches at Kolkata, Mumbai, Chennai and Delhi, the application number being non-traceable or incorrect, acts as a hurdle for the patentee in his endeavour to make the payment for annuity. To refer this case study click here Patent Data Verification in India