When applicants are required to submit drawings in patent applications, black and white line drawings as prescribed in 37 CFR 1.84(a)(1) are required except as follows. Pursuant to 37 CFR 1.84(a)(2), color drawings are permitted in design applications filed under 35 U.S.C. chapter 16. As stated in 37 CFR 1.84(a)(2), color drawings are not ordinarily permitted in utility patent applications, and, as stated in 37 CFR 1.84(b), photographs are not ordinarily permitted in utility or design patent applications, but the USPTO will accept photographs in utility or design patent applications or color drawings in utility patent applications, if they are the only practicable medium for illustrating the claimed subject matter. The photographs and color drawings submitted in utility or design patent applications must be of sufficient quality such that all details in the photographs and drawings are reproducible in black and white in the printed patent. See Legal Framework for Patent Electronic System,
section K, for additional information.