Gas separation: apparatus – Magnetic separating means
Patent
1974-09-03
1976-11-02
Klein, David
Gas separation: apparatus
Magnetic separating means
317262A, 96 1TE, G03G 1314
Patent
active
039895190
ABSTRACT:
A method for the contrast enhancement of an electrostatic latent image in a TESI-type system or the like, which comprises positioning a photoconductive member adjacent a dielectric surface, and applying an electrical potential between the photoconductive member and dielectric surface while irradiating selected portions of the photoconductive member, to cause electric charge formation on selected portions of the dielectric surface corresponding to the irradiated portions of the photoconductive member. In accordance with this invention, the electrical potential is applied as a plurality of discrete pulses, the pulses of applied electrical potential being separated by time periods in which the applied potential is essentially zero. By this method, the relative electric charge density in the selected portions of the dielectric surface is increased over any electric charge density in the portions of the dielectric surface which do not correspond to the irradiated photoconductive member portions.
REFERENCES:
patent: 2825814 (1958-03-01), Walkup
patent: 3057275 (1962-10-01), Walkup et al.
patent: 3370212 (1968-02-01), Frank
Dresner Arthur
GAF Corporation
Goodrow John L.
Kehm Walter C.
Klein David
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