Patent Expiration Calculator
without the guesswork.
Patent Expiration Maintenance Fee Calculator — Separate the nominal U.S. patent-term estimate, PTA/PTE/disclaimer inputs, utility maintenance windows and live USPTO status. Uses a focused calculator with visible assumptions. Inputs stay in your browser.
The tool separates the nominal patent-term estimate from utility maintenance-fee windows and live USPTO status. It does not declare a patent valid, enforceable or expired.
Context matters.
- USPTO says it does not determine individual expiration dates and provides its own detailed term calculator. Continuations, international filings, PTA/PTE, disclaimers, litigation and terminal events can change the analysis.
- Utility maintenance fees can generally be paid without surcharge during years 3–3.5, 7–7.5 and 11–11.5 after issue, followed by six-month surcharge grace periods. The Maintenance Fees Storefront controls the live dates and amounts.
- Design and plant patents do not have maintenance fees. Reissue utility patents require original-family and reissue-specific review and are intentionally blocked from the simple path.
Sources & scope
This page shows the source trail, jurisdiction and review date alongside the result. Always confirm time-sensitive rules with the linked authority.
What to know before using the result.
Is every U.S. patent simply twenty years from filing?
No. Utility and plant patents generally use the earliest effective filing date, while design patents use 14 or 15 years from grant. Pre-1995, reissue, PTA/PTE and disclaimer rules can change the result.
Which patents require maintenance fees?
Utility and reissue utility patents generally do. Design and plant patents do not have USPTO maintenance fees.
Does the estimated term date prove the patent is active or enforceable?
No. Live Patent Center and maintenance status, claims, disclaimers, court decisions and other legal issues control.