Timeline of United States inventions (1890–1945) of these fibers for textile applications is more recent. The first commercial production of fiberglass was in 1936. In 1938, fiberglass was invented by Russell Games Slayter of Owens-Corning. 1938 Xerography Xerography, which means "dry writing" in Greek, is a process of making copies. Xerography makes copies without using ink. In this process, static electricity charges a lighted plate; a plastic powder is applied to the areas of the page to remain white. The photocopier was invented in 1938 by Chester Floyd Carlson who marketed his revolutionary device to about 20 companies before he could interest any. The Haloid Company,
N. S. B. Gras N. S. B. Gras N. S. B. Gras (1884–1956) was a Canadian professor at the Harvard Business School who invented the academic discipline of Business History. Gras was born in 1884 in Toronto, Ontario. He graduated from the University of Western Ontario. He went on to receive a PhD in Economics from Harvard University. Gras taught Economics at the University of Minnesota. Gras was appointed as Professor of Business History by Dean Wallace Brett Donham in 1927. He invented this new academic discipline, which only existed as his job title at the time. From the outset, Gras made sure to