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US Patent 7947419 Toner, developer, and image forming method

Patent 7947419 was granted and assigned to RICOH COMPANY,LTD. on May, 2011 by the United States Patent and Trademark Office.

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Patent Jurisdiction

United States Patent and Trademark Office

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Patent Number

Patent Inventor Names

Naohiro Watanabe1

Hiroshi Yamashita1

Shinichi Wakamatsu1

Tsuyoshi Sugimoto1

Date of Patent

May 24, 2011

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Patent Application Number

122483131

Date Filed

October 9, 2008

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Patent Citations Received

US Patent 12078961 Toner, method of manufacturing toner, toner storage unit, image forming apparatus and method of forming image

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Patent Primary Examiner

1

Patent abstract

A toner including a binder resin including a polyester resin, a colorant, and a release agent including a polyglycerin ester having a melt viscosity of from 1.0 to 40 mPa·sec at 120° C. and a hydroxyl value of from 0 to 100 mgKOH/g is provided. The polyglycerin ester is an ester of a polyglycerin having an average polymerization degree of from 2 to 10 and an aliphatic acid having 16 to 24 carbon atoms in average.

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