100% Free Tools
Free Patent Tools
Practical tools for patent attorneys and agents. Calculate expiration dates, monitor application status, and streamline your prosecution workflow — all free.
Patent Expiration Calculator
Calculate US utility patent expiration dates with full transparency. Computes earliest effective filing date, patent term adjustment (PTA), and terminal disclaimer caps.
Try ToolApplication Monitor
Track up to 5 US patent applications and receive email alerts for major prosecution events like office actions, allowances, and abandonments.
Try ToolAssignment & Ownership Lookup
Look up the recorded assignment history for any US patent. See ownership transfers, security interests, encumbrances, and the apparent current owner.
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Coming Soon
Another tool to streamline your patent workflow is in development.