How much does it cost to file a provisional patent application (USPTO Fees)?
The USPTO Fees webpage indicates that the present USPTO (government) fee (as of 08.25.10) for filing a provisional patent application is $220 for a large entity (and $110 for a small entity). Additionally, patent practitioner professional service fees (which are determined by each patent practitioner) are separate from the aforementioned USPTO fees. As USPTO fees may change at any time, the reader should review the aforementioned USPTO webpage to obtain the most updated information regarding government fees.