calculators, tools and resources
US National Stage
tools and resources for Global inventors, whether from the US, Canada,
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.
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.
Calculate the time limits for submission of priority document, international publication and entry into the national/regional phase.
Determine the expiration date and maintenance fee dates for US utility patents.