IPFees: Model-Driven Quotation of Patent Filing Costs Across Jurisdictions

Valer Bocan

When a client asks what it would cost to enter the national phase in twenty countries, the firm must read twenty fee schedules, each with its own rules for what is charged and when. It must work out the official fees, collect its associates' charges and convert everything into the client's currency, and the client may still decline the offer. IPFees is an open-source platform that answers such a request from executable models. Each office's fee schedule is an IPFLang model, and every service the platform offers is derived from those models. They yield the questionnaire a practitioner fills in, the quote in the client's currency, the explanation of each amount down to the rules that did not apply, what-if alternatives, a web service interface and the checks run when a schedule is saved. Adding an office or changing a fee is therefore an edit to a model, not to the application. The reference corpus models 118 offices, and one questionnaire of 17 inputs covers any selection of them. A twenty-office quote is priced in 42 ms and all 118 offices in 0.24 s. The corpus encodes the fees in force in October 2026: every schedule was brought fee by fee to the offices' published tables, and 13 of its 451 fee lines could not be settled from them. IPFees is released under GPL-3.0, with a public sandbox instance.