There's no way to file a patent application entirely for free, but official fees can be very low: US micro entity status brings USPTO fees for a provisional filing down to around $65, and initial national filings at offices like the UK IPO cost little in official fees. The USPTO's Patent Pro Bono Program connects qualifying under-resourced US inventors with volunteer attorneys, several offices offer SME fee reductions, and some universities and startup incubators also offer patent cost assistance.
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