Although this chapter is smaller, it is tested quite heavily. The patent bar exam always has several questions pertaining to maintenance fees on it. Pay extra attention to when maintenance fees are due.

Maintenance fees:
Maintenance fees are required on all patents issued after December 12, 1980 except design or plant patents

The fees are due at three time periods throughout the life of a patent:
1. 3 years and 6 months after grant, $830.00
2. 7 years and 6 months after grant, $1,900.00
3. 11 years and 6 months after grant, $2,910.00

There is a grace period of 6 months which begins after the three time periods mentioned above, the grace periods end at:
1. 4 years after grant
2. 8 years after grant
3. 12 years after grant

When paying during the 6 month grace period, there is a surcharge required in addition to the payment of the maintenance fee