A Patent specification must contain one or more drawings, if an invention's embodiments cannot be disclosed by textual description alone. This basic rule is applicable in all important patent systems such as the US, the Europe, and the PCT. The US Patent Rules specify the requirements regarding patent drawings.

        Patent drawing is required to understand the invention. Patent drawing must show every feature of the invention specified in the claims. All patent drawings must show every feature of the invention specified in the claims, and is required by the Patent Office Standards to be in a particular form.

        Almost all inventions in the engineering fields will require several sheets of drawings to fully and particularly describe an invention. Drawing figures with appropriate figure numerals sprinkled around them is therefore a usual component of a patent specification (except in chemistry and biotechnology areas). Well developed drawings act as the basis for ascertaining the adequacy of a patent disclosure - whether or not the text description and drawings adequately support the claimed invention; and disclose the best mode of the invention.

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