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)
What this calculator tells you
Contract end date
The exact date your contract term expires based on start date and duration
Time remaining
How many days are left until your contract ends so you can plan ahead
Renewal window
Whether you are approaching a renewal period that may require action
Expiration status
Whether the contract has already ended or is still active
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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