Image courtesy of the U.S. National Archives.
Interested in taking a patent searching class? The Georgia Tech Library teaches excellent workshops on patent resources. Check out the schedule on their library guide:
Use these databases to search for and read the full text of U.S. and international patents. Start with SciFinder-n.
Otherwise, try esp@cenet or the U.S. Patent and Trademark Office (USPTO), depending on when and where the patent application was filed.