Calculation of Patent Term Adjustment PTA is calculated as the number of days by which the USPTO examination delays exceeded applicant delays during prosecution. The formula for calculating PTA is: PTA = (Days of PTO delay) – (Days of Applicant Delay)

In general, a PTA is calculated as PTO delays minus Applicant delays. The difference (if positive) in the delay is added to the patent term. The patent applicant is given more time at the end of the patent for delays caused by the patent office.

The calculation of PTA often involves a specific formula that weighs various periods of delay against the maximum allowable extension. The formula can be summarized as follows: Patent Term = Original Patent Term + (USPTO Delays) – (Applicant Delays)