Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2006-03-31
2009-08-18
Chapman, Mark A (Department: 1795)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S110400, C430S122500, C430S122510
Reexamination Certificate
active
07575840
ABSTRACT:
The toner of the present invention is characterized in that the charges rise up rapidly, the charge quantity is not insufficient nor excessive, the photoreceptor contamination is minimized and the toner is endurable under harsh conditions and against the high stress usage. The magnetic particle contained in the toner is of average particle size 0.01 μm through 0.50 μm, is of octahedron shape that is a convex polyhedron surrounded by eight triangles as a basis, each of vertexes and edges of the octahedron being in a curved surface shape and having a portion that can be taken as a straight line on the outer periphery of a projected image of said octahedron. The sphericity of the toner is 0.94 through 0.98. Here, the sphericity is defined by C2/C1, where C1 is a circumferential length of an image projected on a plane and C2 is a circumferential length of an assumed circle area as same as that of the projected image. Further, a number content of the toner of particle size 0.6 μm through 2.0 μm is smaller than 10%.
REFERENCES:
patent: 7410740 (2008-08-01), Nakayama et al.
patent: 9-59024 (1997-03-01), None
patent: 11-153882 (1999-06-01), None
patent: 11-288125 (1999-10-01), None
patent: 2000-162817 (2000-06-01), None
patent: 2000-242029 (2000-09-01), None
Mizuhata Hiroshi
Nakayama Yukinori
Satou Kousuke
Teramoto Kouzou
Chapman Mark A
Kyocera Mita Corporation
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