The fees of the Bureau are nonrefundable. Pay or look up maintenance fees. PTAB.Each patent application has several forms that must be filled out and submitted. A list of these forms can be found here. This is the easiest way to electronically fill out the forms and prevent losing any information that you've entered. Also, it's typically impossible for most inventors to afford the cost of a nonprovisional patent application. More information may be found on the 2018 Fee Study webpage. Notice. In the fees themselves or fluctuations in exchange rates. If you cannot file online. You can fill in a form and email or post it to the IPO .