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In general, drawings are necessary for patent approval. The only time an applicant can do away with patent drawings is when the invention relates to a chemical compound, or when claiming a composition, method or process.

Requirements for filing a provisional application: A detailed written description of the invention including drawings. ... Title of the invention. Name(s) of all inventors. Inventor(s) residence(s) Name and registration number of attorney or agent and docket number (if applicable) Correspondence address.

Common sizes include 8.5? x 11? or A4 paper size, with a recommended margin of at least one inch on all sides. Digital drawings must meet the file format and resolution specifications provided by the patent office. Number each drawing sheet consecutively in Arabic numerals (e.g., 1, 2, 3).

Drawings submitted to the Office must be made on paper which is flexible, strong, white, smooth, non-shiny, and durable. All sheets must be reasonably free from cracks, creases, and folds. Only one side of the sheet may be used for the drawing.

Separate from the specification, a patent application is required to contain drawings if drawings are necessary to understand the subject matter to be patented. Most patent applications contain drawings. The drawings must show every feature of the invention as specified in the claims.

Beyond requiring at least one drawing, it is advised that several drawings representing different layers of the invention be made to allow the reviewer to reference the drawings while reading the description, thus strengthening the scope and enforceability of the patent protection.