US Patent 8043781 Toner, two-component developer and image formation device
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Patent abstract
A toner comprising a small-particle diameter external additive having a number average particle diameter of 7 to 20 nm, a large-particle diameter external additive having a number average particle diameter of 40 to 80 nm and a toner particle having a volume average particle diameter of 4 to 7 μm, wherein the large-particle diameter external additive is stuck to the surface of the toner particles in a semi-embedded state and has a rate of liberation of 0.1% by weight or less from the surface of the toner particle.
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Patent Inventor Names
Takahiro Bito0
Takeshi Satoh0
Tatsuo Imafuku0
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US Patent 08043781 Toner, two-component developer and image formation device US Patent 8043781 Toner, two-component developer and image formation device
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Patent Number
08043781
Patent Number
8043781
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US Patent 08043781 Toner, two-component developer and image formation device
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Is a
Patent jurisdiction
Patent number
08043781
Date of patent
October 25, 2011
Patent application number
12184680
Date Filed
August 1, 2008
Patent primary examiner
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