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:
Jul. 17, 2012
Filed:
Apr. 30, 2008
Jun Ikami, Nagoya, JP;
Masateru Kawamura, Toyoake, JP;
Jun Ikami, Nagoya, JP;
Masateru Kawamura, Toyoake, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya-shi, Aichi-ken, JP;
Abstract
A developing apparatus is described. The developing apparatus includes a transport member including a plurality of electrodes forming a traveling wave electric field by successively applied voltages and a casing storing a toner transported by the transport member, wherein the activity of the toner based on the following measuring method shown in (1) to (3) is not more than 2.0×10mol/g: (1) dipping the toner in an aqueous solution containing an excess equivalent of benzethonium chloride with respect to electrostatically active polar groups present on the surface of the toner to electrostatically react the polar groups and the benzethonium chloride with each other; (2) adding sodium lauryl sulfate dropwise to the aqueous solution to react the same with the residual benzethonium chloride, thereby measuring the quantity of the sodium lauryl sulfate reacting with the residual benzethonium chloride; and (3) calculating the activity on the surface of the toner from the quantity of the reacting sodium lauryl sulfate.