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:
Mar. 06, 1990
Filed:
Dec. 14, 1988
Applicant:
Inventors:
Serge M Tavernier, Lint, BE;
Pierre R De Roo, Schoten, BE;
Assignee:
Agfa-Gevaert N.V., Mortsel, BE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
4301066 ; 430108 ; 430122 ;
Abstract
Magnetic carrier particles that can be positively charged triboelectrically and are suited for serving in magnetic brush toner-carrier development wherein said carrier particles comprise finely divided magnetically attractable powder dispersed in a resin binder which for at least 75% by weight consists of the acid-base reaction product of at least one acidic binder resin having an acid number in the range of 5 to 50 mg KOH/g, and at least one basic binder resin having free amin groups in an amount equivalent with 2 to 50 mg KOH/g and being present in an amount of at least 10% by weight with respect to such acidic resin.