Know Exactly When
Any Patent Expires
Accurate patent expiration tracking with transparent calculations. Built for patent attorneys and IP law firms.
Try It Now - Free Patent Lookup
Enter any US patent number to see the calculated expiration date
Why PatentClock?
Accurate Calculations
Our algorithm accounts for PTA, PTE, terminal disclaimers, and maintenance fee status to provide the most accurate expiration dates.
Transparent Breakdown
See exactly how each expiration date is calculated with detailed breakdowns showing every adjustment and its source.
Never Miss a Deadline
Get email alerts at 12 months, 6 months, 90 days, and 30 days before any patent in your watchlist expires.
Lightning Fast
Instant lookups with smart caching. Results are stored and updated automatically so you always have the latest data.
Team Collaboration
Share watchlists with your team. Pro and Firm plans support multiple user seats for seamless collaboration.
Secure & Reliable
Your data is encrypted and backed up. We take security seriously so you can focus on your work.
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