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:
Nov. 09, 1999
Filed:
Mar. 23, 1998
Minolta Co., Ltd., Osaka, JP;
Abstract
A liquid developer for electrophotography using a polyester resin as a toner binder resin which is suitable for high-speed systems and has excellent stability over time is disclosed. The invention is a novel liquid developer for electrophotography having colored particles dispersed in an electrically insulated fluid medium. The liquid developer includes an oil-soluble ionic surface active agent as a charge controller. According to one embodiment, the colored particles include a binder resin having an acid value of 40 mgKOH/g or higher but less than or equal to 100 mgKOH/g. According to another embodiment, the colored particles include a binder resin having a glass transition temperature Tg of 35.degree. C. or higher but less than or equal to 65.degree. C.