Calculate the projected lifespan of your asset. Enter your filing parameters to accurately estimate expiration dates for utility, plant, or design patents.
Required. Dictates statutory rule (14 or 15 years).
Required. Date USPTO officially granted the patent.
Estimated Expiration Date
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Legal Disclaimer: This estimator is provided by en.starsandsand.net for educational and preliminary estimation purposes only. The mathematical results generated do not constitute formal legal advice. Maintenance Fees: Utility and plant patents must pay maintenance fees at 3.5, 7.5, and 11.5 years; failure to pay results in premature expiration prior to this calculated date. This tool does not verify fee status. Please consult with a registered patent attorney for binding docketing determinations.