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ICOHTEC NEWSLETTER No 156, April 2018 www.icohtec.org ELECTROPHOTOGRAPHY by Chester F. Carlson, Jackson Heights, N. Y. Patent filed April 4, 1939. Patented October 6, 1942 UNITED STATES PATENT OFFICE 2,297,691.
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Document Date: 2018-05-14 02:24:35
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ICOHTEC NEWSLETTER No 156, April 2018 www.icohtec.org ELECTROPHOTOGRAPHY by Chester F. Carlson, Jackson Heights, N. Y. Patent filed April 4, 1939. Patented October 6, 1942 UNITED STATES PATENT OFFICE 2,297,691.