Do I Need a Working Model or Prototype of My Idea Prior to Filing for Patent Protection
A working model or prototype is not necessary before the filing of a patent application at the U.S. Patent and Trademark office. Often, however, clients will provide me with hand-drawn sketches or drawings of their invention.
Where the invention is a process or method, a flow chart showing the steps can be prepared. Such materials are very helpful to us in understanding the unique features of the invention and provide a starting point from which professional patent illustrations can be prepared.