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:
Sep. 03, 1991
Filed:
Aug. 25, 1989
Applicant:
Inventor:
Ronald Swidler, Palo Alto, CA (US);
Assignee:
CommTech International Management Corporation, Menlo Park, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ; G03G / ;
U.S. Cl.
CPC ...
430115 ; 430115 ; 430137 ; 430112 ;
Abstract
An electrophotographic liquid developer composition is provided containing a charge director which is a salt of a trivalent metal and an aromatic acid such as diisopropyl salicylic acid. For consecutive color toning processes, it is preferred that the concentration of charge director be maintained below some defined maximum value so that substantially all of the charge director is associated with toner. Methods for making and using the novel compositions are provided as well.