Free Tools
Patent Tools
Free tools to research, calculate, and understand patents — no account required.
Available
Patent Expiry Calculator
Enter a filing date to calculate the exact expiry date, maintenance fee schedule, and current status of any US patent.
Calculate →Available
Patent Claim Explainer
Paste any patent claim and get an instant plain-English breakdown — what it covers, what it doesn't, and the key legal terms defined.
Explain a claim →Coming soon
Prior Art Search
Search for existing patents and publications that could affect a patent application. Coming soon.
Coming soon