An advanced CAD/CAM/CAE software mathematically slices the computer model of the object into a large number of thin layers. Wherever the beam strikes the surface, the photopolymer polymerizes/crosslinks and changes to a solid. The light beam, moving under computer control, draws each layer of the object onto the surface of the liquid. In Hull's patent, a concentrated beam of ultraviolet light is focused onto the surface of a vat filled with liquid photopolymer. He defined stereolithography as a method and apparatus for making solid objects by successively “printing” thin layers of the ultraviolet curable material one on top of the other. Patent 4,575,330 entitled “Apparatus for Production of Three-Dimensional Objects by Stereolithography” issued on March 11, 1986. Hull coined the term “stereolithography” in his U.S. The claimed reason was “for lack of business perspective”. The application of French inventors were abandoned by the French General Electric Company (now Alcatel-Alsthom) and CILAS (The Laser Consortium). It was three weeks before Chuck Hull filed his own patent for stereolithography. But on JAlain Le Méhauté, Olivier de Witte and Jean Claude André filed their patent for the stereolithography process. Hull first came up with the idea in 1983 when he was using UV light to harden tabletop coatings. He is also a distinguished alumni from Colorado Mesa University. Chuck received a Bachelor of Science in engineering physics from the University of Colorado in 1961. He graduated from Central High School in Grand Junction, Colorado. His early life was spent in Clifton and Gateway, Colorado. Early life Ĭhuck Hull was born on in Clifton, Colorado, the son of Lester and Esther Hull. He was inducted into the National Inventors Hall of Fame in 2014 and in 2017 was one of the first inductees into the TCT Hall of Fame. patents as well as other patents around the world in the fields of ion optics and rapid prototyping. He is one of the inventors of the SLA 3D printer, the first commercial rapid prototyping technology, and the widely used STL file format. Hull born May 12, 1939) is the co-founder, executive vice president and chief technology officer of 3D Systems.
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