Xerography A dry copying process in which black or colored powder adheres to parts of a surface remaining electrically charged after being exposed to light from an image of the document to be copied.
The technique was originally called electrophotography, but it was later renamed xerography — from the Greek roots "xeros" (dry) and "graphia" (writing). Its fundamental principle was invented by Hungarian physicist Pál Selényi, and based on his publications Chester Carlson applied for and was awarded U.S. Patent 2,297,691 in 1942. |
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