Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1978-02-28
1981-09-01
Welsh, John D.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430137, 148 635, 148 203, G03G 910
Patent
active
042872839
ABSTRACT:
An iron powder developing carrier for developing an electrostatic latent image, a manufacturing method thereof, a developer containing said developing carrier and a method of forming a visible image by using said developer.
Said iron powder developing carrier has the apparent density from 1.5 to 2.5. Said manufacturing method comprises the steps of sintering a raw iron powder having been ground to particles of not larger than 50 microns in diameter without using any binder agent at the temperature from 900.degree. to 1200.degree. C. to form an sintered body, grinding and classifying said sintered body into an intermediate iron powder having the particle diameter from 50 to 200 microns, then treating said intermediate iron powder to oxidize at the temperature from 280.degree. to 390.degree. C., and adjusting the resultant iron powder so as to have the apparent density from 1.5 to 2.5.
REFERENCES:
patent: Re27912 (1974-02-01), Millu
patent: 2874063 (1957-02-01), Greig
patent: 2890968 (1959-06-01), Giaimo, Jr.
patent: 3718594 (1973-02-01), Millu
patent: 3795618 (1974-03-01), Kasper
patent: 3849182 (1974-11-01), Hagenbach
Nishimura Takeo
Takahashi Nobuo
Tomono Makoto
Watanabe Shotaro
Yamakawa Goichi
Konishiroku Photo Industry Co,., Ltd.
Nilles James E.
Welsh John D.
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