Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2003-07-15
2009-11-03
Dote, Janis J (Department: 1795)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S108300, C430S108600, C430S123510, C106S426000, C106S446000, C106S450000, C106S454000, C106S457000, C106S466000, C106S470000, C106S479000, C106S480000, C106S482000, C106S483000, C106S490000, C423S327100, C423S331000, C423S335000
Reexamination Certificate
active
07611815
ABSTRACT:
An external additive for a toner for electrophotography which contains oxide fine particles which contain silicon, in which the oxide fine particles have a primary particle diameter of 30 nm to 300 nm in number average, a standard deviation σ of a particle size distribution of the primary particle diameter satisfies a relation of: R/4≦σ≦R, in which the R expresses the primary particle diameter,the oxide fine particles are substantially spherical having a circularity SF1 defined as equation (1) of 100 to 130 and a circularity SF2 defined as equation (2) of 100 to 125;in-line-formulae description="In-line Formulae" end="lead"?SF1=(L2/A)×(π/4)×100 equation (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?SF2=(P2/A)×(1/4π)×100 equation (2),in-line-formulae description="In-line Formulae" end="tail"?in the equations, “L” expresses the absolute maximum length of the oxide fine particles; “A” expresses a projected area of the oxide fine particles; and “P” expresses a maximum perimeter of the oxide fine particles.
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Asahina Yasuo
Mochizuki Satoshi
Nakayama Shinya
Sugiura Hideki
Umemura Kazuhiko
Dote Janis J
Oblon, Spivak, McClellland, Maier & Neustadt, L.L.P.
Ricoh & Company, Ltd.
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