Yes, a utility patent application typically requires drawings or illustrations to help depict and explain the invention. The drawings must be sufficient to show the invention and its operation, and must clearly and accurately represent the invention. They should also be clear enough for someone skilled in the relevant field to understand the invention and how it works. There are a few exceptions to this requirement, however. For example, if the invention is a chemical compound or composition, it may not be necessary to include drawings. In these cases, a description of the invention and any necessary formulas or equations may be sufficient. It’s important to note that the quality and clarity of the drawings can have a significant impact on the success of the patent application. Therefore, it’s often a good idea to work with a professional patent illustrator to ensure that your drawings are of the highest quality and accurately depict your invention.