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. 10, 1992
Filed:
Feb. 21, 1991
Thomas A Hayes, Jr, Santa Ana, CA (US);
Clem J Nagley, Rochester, NY (US);
Anthony L Paolini, W. Henrietta, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A developer unit which develops an electrostatic latent image recorded on a photoconductive member used in an electrophotographic printing machine. The developer unit uses a developer material which ages during the life of the electrophotographic printing machine. Additional developer material having at least carrier granules and toner particles, is supplied to the developer material in the developer unit to extend the life of the developer material. Discharge of developer material from the developer unit is controlled by a permanent magnet and an electromagnet positioned adjacent an exit port in the developer unit. The permanent magnet generates a magnetic flux field in the region of the exit port to form a developer material curtain which prevents the passage of developer material from the exit port. When the electromagnet is energized, it generates a magnetic flux field which attracts developer material from the developer material curtain. Upon de-energization of the electromagnet, the developer material attracted thereto is discharged therefrom.