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US 4,078,929 AGranted
Method for two-color development of a xerographic charge pattern
AssigneeXerox Corporation
InventorRobert W. Gundlach
Life of this patent
Estimating the term…
Abstract
A charge pattern of a single polarity and having at least three different levels of potential is developed in two colors by utilizing relatively negatively charged toner particles of one color and relatively positively charged toner particles of a second color.
Claims10
A method for producing a xerographic image having two separate information areas in two separate colors, respectively, the method comprising:
- (a) creating a charge pattern of one polarity on an imaging surface wherein the pattern comprises a first area of charge corresponding to the original image background, a second area of charge of a higher potential than the first area of charge and a third are of charge of a lower potential than the first area of charge, said second and third areas of charge corresponding to two separate information areas of the original image, respectively;
- and
- (b) developing the charge pattern with toner particles of a first color and toner particles of a second color, the toner particles of said first color being positively charged and the toner particles of said second color being negatively charged, wherein said two separate information areas of the original image are reproduced in said two separate colors, respectively.
Dependencies are inferred from the claim text.