We have received with thanks your check in the amount of US$202.
As per your instructions, we have on February 17, 2016 paid 4th annuity fee for the above-referenced patent. Enclosed please the official receipt for your.
In reviewing our accounting record, we have found that the 4th annuity fee is US$274 not US$202 (Please see the attachment ). In this connection, I hope you will settle the balance of US$72.
Please do not hesitate to contact us if you have any questions.
The next annuity will be due on May 31, 2017. Reminders for payment of next annuity will be sent in due time.