Color electrostatographic process and material

Details Color electrostatographic process and material Color electrostatographic process and material

1978-06-05

1981-02-10

Martin, Jr., Roland E.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

To produce color reproduction

430 55, 430 57, G03G 1301

Patent

active

042502390

ABSTRACT:
A photoconductive drum formed with two photoconductive layers of different spectral sensitivty is charged a first time in the dark or while rendering one of the layers conductive and a second time with an opposite polarity in the dark to form a stratified electrostatic charge pattern. Exposure to a light image of an original document causes the layers to conduct according to color. Toner particles of two colors such as red and black adhere to respective areas of the resulting electrostatic image which have opposite polarities. Transfer of the resulting toner image to a copy sheet produces a finished copy in two colors.

REFERENCES:
patent: 2962375 (1960-11-01), Schaffert
patent: 3775106 (1973-11-01), Tamai et al.
patent: 3795513 (1974-03-01), Ciuffini
patent: 3844783 (1974-10-01), Matsumoto et al.
patent: 3884686 (1975-05-01), Bean
patent: 4039831 (1977-08-01), Lehmann
patent: 4078929 (1978-03-01), Grundlach
Schaffert, "Increasing the Sensitivity of Xerographic Photoconductors", IBM Tech. Discl. Bull., vol. 6, No. 10, Mar. 1964, p. 60.

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