Patent Expiration Calculator
Know when patent protection ends and plan renewals or strategy.
Enter your contract details
The date your contract begins
Length of your contract (in days, weeks, months, quarters, or years)
Frequently asked questions
Frequently asked questions about patent expiration calculator
Utility: 20 years from filing; design: 15 years from grant; plant: 20 years. Maintenance fees apply.
Typically 20 years from filing (utility) if maintenance fees are paid on schedule.
Generally no; limited extensions exist (e.g., pharma term extensions or prosecution delays).
The invention enters the public domain; anyone may use or sell it.
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