Invention drawings are created to show the invention of an inventor to the patent examiner. These drawings are used for patenting the invention if the inventor has already prepared the invention with the invention in mind. The patent examiner will review the invention drawing showing the claimed invention and determine if it is legally patentable. The patent office can only grant a patent if they believe the invention is new and not obvious to other people.
Many times inventors will submit drawings showing how their invention works but do not include any description of what these devices or machines actually do. This could be described in a way that describes the invention as a machine or device and not as a human invention. For example, if the invention is a hand blown glass painting, the patent applications may describe the artwork rather than the machine or device that creates the art work. The invention drawings should include detailed descriptions of the method or process of carrying out the invention which will be in the human invention process. A description of the way the invention fits into the category of new invention and specifically new inventive process is called a claim.
There are many places where inventors can obtain a patentable invention drawing. The patent office will hold the drawings for a time and review them before issuing a patent. There are many resources that provide drawing examples. It is important that inventors keep accurate records of all drafts and submissions including drawing details.