Patent Expiration Calculator
Separate the nominal U.S. patent-term estimate, PTA/PTE/disclaimer inputs, utility maintenance windows and live USPTO status. 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
The calculation guide and this source trail show what the result means, where the rule came from and when it was last reviewed. This is source-and-calculation QA, not a claim of medical, legal, tax or other professional review; time-sensitive decisions still belong with the linked authority.
A visible path from input to answer.
Separate the nominal U.S. patent-term estimate, PTA/PTE/disclaimer inputs, utility maintenance windows and live USPTO status. The page keeps the calculation scope and its limits beside the result so the output can be checked, copied or revisited.
- Read the record. The calculator uses Patent record review date, U.S. patent type, Patent issue / grant date, Earliest effective nonprovisional filing date and Design application filing date and 7 additional fields supplied in the form.
- Apply the scope. It applies the United States patent-record planning — USPTO family dates, term adjustments, disclaimers, maintenance windows and live status control reference and the explicit date, unit and counting conventions shown in the result.
- Expose the checkpoints. Intermediate rows, warnings and timeline events stay visible; the emphasized row identifies the primary checkpoint when one exists.
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.
- Validity / enforceability / freedom to operateNot determined
Calculation purpose: Separate the nominal U.S. patent-term estimate, PTA/PTE/disclaimer inputs, utility maintenance windows and live USPTO status. This is a high-sensitivity reference output; the linked authority or qualified professional controls the final decision.
Calendar inputs use plain year-month-day semantics. Leap days, month ends, date-pair order and unsupported dates are checked before the result is shown.
Rule set 1.1.0 · Last reviewed 2026-08-22 · Next review due 2027-02-22. The source panel below contains the linked evidence.
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.