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:
Feb. 22, 2005
Filed:
Apr. 11, 2002
Applicants:
Tomomi Yamazaki, Tokyo, JP;
Hirofumi Iemura, Tokyo, JP;
Inventors:
Tomomi Yamazaki, Tokyo, JP;
Hirofumi Iemura, Tokyo, JP;
Assignee:
Toyo Ink Manufacturing Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G009/097 ;
U.S. Cl.
CPC ...
Abstract
A positively charging dry toner for developing an electrostatic latent image including a nigrosine dye or nigrosine pigment containing 500 ppm or less nitrobenzene and 800 ppm or less aniline as a charge controlling agent. The dye or pigment is prepared by dispersing the nigrosine dye or nigrosine pigment obtained by an usual method in a solvent, adding an oxidizing agent such as bleaching powder to the solvent dispersion to conduct oxidation treatment and, if necessary, removing the solvent by steam distillation.