John Wesley Hyatt, American engineer (d. 1920)
John Wesley Hyatt (November 28, 1837 – May 10, 1920) was an American inventor. He is mainly known for simplifying the production of celluloid.
Hyatt, a Perkin Medal recipient, is included in the National Inventors Hall of Fame. He had nearly 238 patents to his credit, including improvements to sugar cane mills and water filtration devices.