The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 2005
Filed:
Mar. 24, 2003
Tsutomu Teraoka, Kanagawa, JP;
Tsutomu Sasaki, Kanagawa, JP;
Tsuneo Kurotori, Tokyo, JP;
Masahiko Itaya, Tokyo, JP;
Tsutomu Teraoka, Kanagawa, JP;
Tsutomu Sasaki, Kanagawa, JP;
Tsuneo Kurotori, Tokyo, JP;
Masahiko Itaya, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A liquid developer which includes an insulating liquid, and toner fine particles containing a coloring agent and a toner resin. In the liquid developer, its electric capacitance does not significantly vary in an electric circuit where an electrical double-layer capacitor and an electronic resistance corresponding to a velocity of an electron exchange during an electrode reaction are connected in parallel, and a resistance corresponding to an electric conductivity of the insulating liquid is connected in series. The coloring agent has a coating layer so as to maintain distances between the toner fine particles. The insulating liquid has a viscosity of 0.5 mPa·s to 1000 mPa·s, a specific resistance of 1×10Ωcm or more, and a surface tension of 30 dyn/cm or less, and may be a nonvolatile liquid having a boiling point of 100° C. or higher.