Electrophotography – Image formation – Development
Reexamination Certificate
2006-10-24
2006-10-24
Gray, David M. (Department: 2852)
Electrophotography
Image formation
Development
C399S276000, C399S265000, C492S018000, C492S049000, C492S053000, C492S056000, C430S120400
Reexamination Certificate
active
07127200
ABSTRACT:
A developing roller is provided having an elastic layer and a surface layer superposed thereon. The surface layer is formed of a resin material containing nitrogen atoms, and contains at least two types of particles, organic-compound particles (M) and organic-compound particles (N). The particles (N) are composed of nitrogen-containing heterocyclic-compound particles. The number-average particle diameter of the particles (N) in the surface layer is smaller than the number-average particle diameter of the particles (M) in the surface layer. Where the universal hardness of the elastic layer is represented by A and the universal hardness of the developing roller is represented by B, they satisfies 0.9≦B/A≦1.8.
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patent: 5893014 (1999-04-01), Goto et al.
patent: 6393243 (2002-05-01), Satoh et al.
patent: 6512911 (2003-01-01), Arai et al.
patent: 1286225 (2003-02-01), None
patent: 2001-42631 (2001-02-01), None
Ishida Kazutoshi
Nakamura Minoru
Suzuki Takeshi
Yamamoto Arihiro
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