Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2009-03-06
2011-10-18
Rodee, Christopher (Department: 1721)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S111300, C430S111310
Reexamination Certificate
active
08039190
ABSTRACT:
A carrier core material for an electrophotographic developer including Li ferrite, maghemite, and Fe3O4, wherein a part thereof is substituted with Mn, Li content is 1 to 2.5% by weight, Mn content is 2 to 7.5% by weight, and silicon content is 25 to 10,000 ppm, the following equation (1) is satisfied when respective integrated strengths of spinel crystal structure (110), (210), (211), and (311) faces in X-ray diffraction are respectively I110, I210, I211, and I311, a resistivity R50of 50 V across a 6.5 mm gap is 5×107to 7×108Ω, and a resistivity R1000of 1,000 V across a 6.5 mm gap is 1×107to 8×108Ω.in-line-formulae description="In-line Formulae" end="lead"?2<100×(I110+I210+I211)/I311<14 (1).in-line-formulae description="In-line Formulae" end="tail"?
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U.S. Appl. No. 12/399,164, filed Mar. 6, 2009, and entitled “Carrier Core Material for Electrophotographic Developer, Carrier, and Electrophotographic Developer Using The Carrier”.
Aga Koji
Suwa Tomoyuki
Tabira Yasunori
Fraser Stewart
Greenblum & Bernstein PLC
Mitsui Mining & Smelting Co. Ltd.
Powdertech Co., Ltd.
Rodee Christopher
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