I'm about to file a USPTO provisional patent in a couple of weeks.
Is there any upper limit for the number of drawings I can have in my utility patent?
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The USPTO imposes an additional fee beyond the provisional filing fee for each 50 sheets beyond 100 sheets (pages) for a provisional patent application. That fee ranges from $100 for a micro entity, $200 for a small entity and $400 for a large entity. The limit is based on the number of total sheets(pages) in the application, including the drawings and specification. Other than this additional fee, there is no limitation on the number of drawings. There is a similar fee structure for when a utility application is filed based on the provisional application.
Other jurisdictions may have other fee structures for the size of the application.
Please refer to https://www.uspto.gov/learning-and-resources/fees-and-payment/uspto-fee-schedule#:~:text=Patent%20Fees,-The%20fees%20subject&text=The%20%24400%2F%24200%20non,in%20paper%20with%20the%20USPTO. Please note that this size and fees associated with size keep changing from time to time so check for the latest information. As on September 7th 2020 this information is valid