Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2002-12-13
2008-08-19
Goodrow, John L (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S108700, C106S482000, C106S491000
Reexamination Certificate
active
07413838
ABSTRACT:
An external additives for electrophtographic toner comprising finely divided oxide particulate including a silicon compound and a compound for doping said oxide particulate, wherein particle diameter of the primary particle of said finely divided oxide particulate is in the range of 30 nm to 150 nm, and the primary particle of said finely divided oxide particles is substantially spherical shape having the roundness in the range of 0.95 to 0.996, is provided. And this external additives is capable of evading from the embedding of external additives into toner even if after the toner is held in the storage under the condition of high temperature and high humidity, thereby the additives is capable of showing sufficient functions as fluidizing agent and charge supplement agent, and is capable of inhibiting an abnormal charge elevation even after being stored under the low temperature and low humidity.
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U.S. Appl. No. 11/956,378, filed Dec. 14, 2007, Shu, et al.
Iwamoto Yasuaki
Mochizuki Satoshi
Sugiura Hideki
Umemura Kazuhiko
Goodrow John L
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
RICOH Company, Ltd.
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