How does the USPTO determine if drawings are necessary for a patent application?

The USPTO determines the necessity of drawings in a patent application based on whether they are required to understand the invention. According to MPEP 601.01(f) and 35 U.S.C. 113: “The applicant shall furnish a drawing where necessary for the understanding of the subject matter sought to be patented.” Examiners assess the application’s written description to…

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