US Expiration Date Calculation

An incorrect expiration date is never just a bookkeeping error. It can drive a mistimed licensing negotiation, a flawed freedom-to-operate assessment, a missed design-around opportunity, or an enforcement action filed against a patent that has already lapsed. Terminal disclaimers, Patent Term Adjustment corrections, and continuity chains make manual expiration tracking genuinely error-prone, even the USPTO-published PTA figure is itself subject to error. We reconcile every factor, including base statutory term, PTA, Patent Term Extension, terminal disclaimer limitations, and maintenance fee status, against the complete prosecution history, so the date your team relies on is independently defensible.