US Patent 7574164 Developing device and electrophotographic apparatus using the same
Patent 7574164 was granted and assigned to RICOH COMPANY,LTD. on August, 2009 by the United States Patent and Trademark Office.
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Patent abstract
An electrophotographic apparatus includes: a photoconductor; and two developing rollers facing the photoconductor. A developer fed out from between the two developing rollers is supplied to the photoconductor by the two developing rollers to form a toner image on the photoconductor. The developer includes a carrier having a volume-average particle size smaller than 70 μm and a volume resistivity not lower than 106 Ω·cm. A volume ratio of the carrier in a facing portion between the photoconductor and the developing rollers is not lower than 30% and not higher than 46%.
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US Patent 07574164 Developing device and electrophotographic apparatus using the same US Patent 7574164 Developing device and electrophotographic apparatus using the same
Infobox
Patent Number
0757416400
Patent Number
757416400
Edits on 23 Apr, 2023
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Infobox
Is a
Current Assignee
0
Patent Jurisdiction
Patent Number
075741640
Date of Patent
August 11, 2009
0Patent Application Number
112331200
Date Filed
September 23, 2005
0Official Website
Patent Primary Examiner
Edits on 23 Sep, 2022
Golden AI
Infobox
Is a
Current Assignee
0
Patent Jurisdiction
Patent Number
075741640
Date of Patent
August 11, 2009
0Patent Application Number
112331200
Date Filed
September 23, 2005
0Official Website
Patent Primary Examiner
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US Patent 07574164 Developing device and electrophotographic apparatus using the same
Infobox
Is a
Current assignee
Patent jurisdiction
Patent number
07574164
Date of patent
August 11, 2009
Patent application number
11233120
Date Filed
September 23, 2005
Patent primary examiner
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