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:
Jan. 20, 1981
Filed:
Mar. 22, 1979
Peter H Dundas, Pittsford, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A method of manufacturing dust-free spheroidized magnetite beads comprising the steps of introducing raw magnetic ore particles in the presence of an inert non-oxidizing carrier gas to a carbon arc plasma flame assembly to which is fed a controlled amount of nitrogen and argon gas, melting the ore particles to form spheroidized droplets thereof, allowing the spheroidized droplets to fall by gravity in a chamber having a controlled atmosphere while at the same time sweeping the inside chamber wall with a vertical flow of air or an inert gas and providing a horizontal curtain of air or an inert gas at a specific location within the chamber to remove dust formed in the process. The droplets are cooled forming beads of ore, which may be used as a xerographic carrier without further processing.