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:
Dec. 20, 1994
Filed:
Oct. 19, 1992
Masafumi Ata, Kanagawa, JP;
Koichi Kawasumi, Kanagawa, JP;
Yuji Yakura, Kanagawa, JP;
Haruo Watanabe, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A developer for electrostatic electrophotography which comprises a composition of colorant particles, an electric charge supplying agent and a resin binder dispersed in a dispersion medium. The resin binder is a copolymer which has a polyoxyethylene units at side chains thereof, so that the interaction with the electric charge supplying agent is improved. The resultant developer ensures good resolution, gradation and fixing property and is suitable for wet development to give high-quality images. When the copolymer used as the resin binder has styrene units therein, its solubility in the dispersion medium is improved. The developer is either liquid or solid depending on the type of dispersion medium.