Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1978-07-06
1980-06-10
Braun, Fred L.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
346153, 355 3TR, G03G 1314
Patent
active
042071011
ABSTRACT:
Transfer of a powder image from a material carrying the image, such as a photoconductive material utilized for indirect electrophotographic copying, is effected magnetically by employing magnetically attractable developing powder for forming the image and bringing the powder image while under the influence of a magnetic field into contact with a first receiving support that comprises a myriad of zones of a first material which are separated from each other by a second material, one of these materials being magnetizable and the other being not magnetizable. The materials preferably are metals giving the first receiving support a durable smooth surface. The zones of the first material have a diameter and inter-distance of, at most, about 5 times and preferably about 1 to 2 times the diameter of the largest powder particles to be transferred, so usually of about 50 to 100 microns. After being transferred magnetically to the first receiving support the powder image is transferred from it, directly or indirectly, to a final receiving support which usually is plain copy paper.
REFERENCES:
patent: 3093039 (1963-06-01), Rheinfrank
patent: 3106479 (1963-10-01), Evans
patent: 3392642 (1968-07-01), Germer
patent: 3781903 (1973-12-01), Jeffers et al.
patent: 3791843 (1974-02-01), Kohlmannsperger
patent: 3804511 (1974-04-01), Rait et al.
patent: 3902421 (1975-09-01), Takahashi
patent: 3955530 (1976-05-01), Knechtel
Draai Willem T.
Vola Mathias J. J. M.
Braun Fred L.
Johnston Albert C.
Oce'-van der Grinten N.V.
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