Xerox copier was patented in 1938 by Chester Carlson of American nationality. For more than 100 years after his birth, the inventor of Xerography, man that would radically change the way to preserve and share information. Xerography is the technological basis of the printer laser, digital production and since then Xerox copier printer. After graduating in physics, she moved to New York City, getting a job as a patent attorney Assistant. I frequently had to make quite a few copies of hand drawings, work that became tedious and taking into account their myopia and arthritis, his work was even heavier. Carlson immediately identified the need for a simple and practical method of making copies. And as what basically was inventor; started to investigate in what would become, the Xerox Copier. Technical publications with information on the reproduction of photographs found in the public library and was aware that the process was slow and required of the use of many chemicals.
Carlson wondered if it could do so through an electrical method, since he knew that the charged particles adhere to a surface with opposite charge. The problem was how to achieve the particles to be set identically to an image lit on a paper. He filed an application for a patent for the basic concept of electrophotography, but still it failed to perform a correct print dry. Then the decisive discovery took place. He covered a plate of zinc with sulfur, rubbed it with a cotton cloth to create a static electricity charge, placed in front of a transparency with written words and exhibited both in the heat of a lamp. You removed the slide, sprinkled the plate with spores of MOSS, lobbied against dust parchment paper, applied heat and withdrew the paper. At that time saw that paper appeared in the words written on the slide: 10-22-38 ASTORIA, the date and the name of the neighborhood where he worked, Astoria.