Gas separation: apparatus – Magnetic separating means
Patent
1977-08-12
1978-09-12
Welsh, John D.
Gas separation: apparatus
Magnetic separating means
96 15R, 96 27R, 96 48PD, 204 15, 96 68, 250315R, G03G 1524
Patent
active
041134842
ABSTRACT:
A positive image is formed by imagewise passing a current through a substantially uniform layer of physically developable catalyst having a coverage of 1 .times. 10.sup.-6 to 1 .times. 10.sup.-10 g/cm.sup.2. The catalytic ability of the catalyst layer is destroyed by subjecting the image areas to greater than 1 .times. 10.sup.-8 coulombs/cm.sup.2. Physical development of the thus exposed catalyst layer produces the positive image. A photoconductive element which is useful in this process is also disclosed. This photographic element comprises:
(1) a non-catalytic conductive support;
(2) a substantially uniform first layer coated on the conductive support comprising a physically developable catalyst having a coverage of 1 .times. 10.sup.-6 to 1 .times. 10.sup.-10 g/cm.sup.2 of support;
(3) a photoconductive second layer separated from the first layer by an air gap of up to 20 microns; and
(4) a conductive layer over the second layer wherein at least the conductive support (1) or the conductive layer (4) is transparent to the electromagnetic radiation to which the photoconductive second layer (3) is sensitive.
REFERENCES:
patent: 3829317 (1974-08-01), Case
patent: 3893854 (1975-07-01), Honjo et al.
Lelental Mark
Light William Andrew
Eastman Kodak Company
Rosenstein Arthur H.
Welsh John D.
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