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I agree Eric Shain. In fact, this kind of diagrams are quite popular en communication protocol related patents, where interactions between sender and receiver have a sequential order. For example, figures 3, 4 & 5 in Amazon patent US6675196; figure 2 in ATEN patent US7716404B2; or figure 2 in patent application US2004/0100945 A1. Sometimes, you can even ...


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Diagrams, illustrations, photos and graphs are all allowed in a patent application. They are referred to as drawings under 35 U.S.C 113: The applicant shall furnish a drawing where necessary for the understanding of the subject matter sought to be patented. Note from the U.S.C clause above that the purpose of any drawing is only to facilitate the ...


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I would expect that a drawing that conforms to USPTO drawing requirements (black and white comes to mind, exceptions for color is accepted only under documented conditions). A search of patents.google.com would produce the examples provided by user=David. If you suspect that something is prohibited, searching the relevant USPTO requirements (in this case ...


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