US National Stage

tools and resources for Global inventors, whether from the US, Canada,
Europe, the Middle East, Australia, Polynesia, Asia, or the Americas

Free Calculators
Tools & Resources

Patent Related Calculators

These free services are provided by Da Vinci Partners (a Swiss-based U.S. Patent Law Firm) to assist patent attorneys, businesses and inventors.

US National Stage
Are you interested in filing a US National Stage of your PCT application? With our step-by-step online National Stage Fee Calculator, you can have an accurate estimate emailed to you in minutes.

PCT Time Limit Calculator
Calculate the time limits for submission of priority document, international publication and entry into the national/regional phase.

US Utility Patent Maintenance Fee Calculator
Determine the expiration date and maintenance fee dates for US utility patents.

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