Recorders – Magnetographic
Patent
1974-01-07
1976-01-06
Konick, Bernard
Recorders
Magnetographic
178 66A, G03G 1504, G01D 1506
Patent
active
039316270
ABSTRACT:
Electrographic devices and apparatus comprising an original provided with a conductivity pattern ranging from a portion having a greater conductivity to a portion having a lesser conductivity, means for placing a thin layer of electrically chargeable particles in electric contact with said conductivity pattern, and means for generating an electric field of sufficient strength across said layer of electrically chargeable particles and said conductivity pattern so as to transfer electric charges from said conductivity pattern to said electrically chargeable particles so that said particles receive electric charges having different maximum values according to the different conductivities of said portions of said conductivity pattern whereby a portion of said particles are sufficiently charged and removed from said layer of electrically chargeable particles and the remainder of said particles are insufficiently charged so that they continue to remain in said particles layer thereby producing a stable electrographic image.
REFERENCES:
patent: 2901374 (1959-08-01), Gundlach
patent: 2912586 (1959-11-01), Gundlach
patent: 3182591 (1965-05-01), Carlson
patent: 3194674 (1965-07-01), Sakurai
patent: 3234904 (1966-02-01), Wagner
patent: 3257222 (1966-06-01), Carlson
patent: 3266046 (1966-08-01), Boyd
Konick Bernard
Lucas Jay P.
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