On October 6, 1941, photocopying was patented by Chester Carlson (This Day in Patent History)

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Patent Information
Patent Number: US2297691 A
Patent Title: Electrophotography

Publication date: Oct 6, 1942
Filing date: Apr 4, 1939
Priority date: Apr 4, 1939
Inventors: Chester F Carlson

US2297691

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