Electrostatic copying method for forming multiple copies

Details Electrostatic copying method for forming multiple copies Electrostatic copying method for forming multiple copies

1976-04-12

1979-10-30

Martin, Jr., Roland E.

Gas separation: apparatus

Magnetic separating means

252 621P, 101DIG13, 96 1SD, G03G 1316, G03G 910, G03G 914

Patent

active

041727223

ABSTRACT:
This invention provides an electrostatic copying method for forming multiple copies by repeating the process of developing an electrostatic latent image formed on an electrophotographic insulating material with a dry developer comprising electroscopic powder and carrier particles and the process of transferring the thus developed image onto a transfer sheet continuously without erasing said latent image, said carrier particles consisting of an essentially homogeneous ferromagnetic oxide having an apparent electric conductivity in the range of 10.sup.-11 -10.sup.-5 .OMEGA..sup.-1 cm.sup.-1, thereby rendering it possible to form multiple copies compared with the conventional copying methods.

REFERENCES:
patent: 2846333 (1958-08-01), Wilson
patent: 3627682 (1971-12-01), Hall
patent: 3839029 (1974-10-01), Berg et al.
patent: 3944493 (1976-03-01), Jadwin
L. G. van Vitert, J. Chem. Phys., 23, pp. 1883-1887, (1955).
E. E. Riches, "Ferrites," Mills & Boon Limited, London, (1972), Title Page and p. 22.

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