Patent Expiration Lookup

Enter a US patent number to calculate its expiration date with a detailed breakdown of all adjustments and extensions.

Try an example:

How It Works

1. We fetch data from USPTO: Official patent records including filing date, grant date, and other key information.

2. Our algorithm calculates: The base term (20 years from filing for post-GATT patents), plus Patent Term Adjustment (PTA), Patent Term Extension (PTE), and any terminal disclaimer limitations.

3. You get transparency: See the complete breakdown of how we arrived at the expiration date, with confidence scores and warnings for any missing data.

Free users: 10 lookups per month. Need more? Upgrade to a paid plan for unlimited lookups and watchlist tracking.