photocopying

From 1938, the inventor of photocopying, Mr. Chester Carlson, a researcher part time, a patent attorney and inventor. In his role in the Patent Office must make to have a copy on a large number of documents. How you can imagine, this process is complicated and difficult that require new methods to simplify the reproduction of documents. Is when the experiment started with photoconductivity and electro photography.
For operators Carlson came fame and success, if there are copies of the first use of zinc plates and sulphr created. But it took some time for some major companies who are interested in the discovery, because up to now a copy has been calculated using carbon paper, and some with machine guns duplicated. People do not understand why the technology you need. Also in the five years between 1939 and 1944 more than twenty companies share ideas in the background while Carlson tried to sell. IBM and GE are the two companies.