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:
Aug. 13, 1991
Filed:
Sep. 07, 1989
Applicant:
Inventors:
Erwin Czech, Biblis, DE;
Werner Ostertag, Gruenstadt, DE;
Detlef Schulze-Hagenest, Grasbrunn, DE;
Franz-Ulrich Schmitt, Gerlingen, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
430108 ; 428404 ;
Abstract
A novel carrier which is stable and effective over long cycle times (6.times.10.sup.6 prints), has an iron oxide coating of the formula (FeO).sub.x.Fe.sub.2 O.sub.3 where x=0.1-1 and is obtained by treating steel cores (or balls) with defined small amounts of sulfuric acid of defined concentration, partial oxidation of the cores thus treated and drying at 60.degree.-150.degree. C. at .ltoreq.100 mbar.