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. 24, 1995
Filed:
Mar. 21, 1994
Thomas J Behe, Webster, NY (US);
Heiko Rommelmann, Webster, NY (US);
Daniel R Gilmore, III, Fairport, NY (US);
Gerald T Lioy, Webster, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A developer unit adapted to develop a latent image with toner particles. The unit includes a housing defining a chamber for storing a supply of toner particles in the chamber. The unit also includes a donor roll including an electrically non-conductive circumferential surface having a conductivity less than 10.sup.-8 (ohm-cm).sup.-1 and having a central region and opposed marginal regions disposed on either side of the central region with the diameter of the central region being less than the diameter of the opposed marginal regions. The donor roll is spaced from the latent image to form a development zone. The unit further includes an electrode member which is positioned in the development zone adjacent opposed marginal regions and spaced from the central regions of the donor roll. The electrode member is electrically biased to detach toner particles from the donor roll to form a toner powder cloud in the development zone with toner particles from the toner cloud developing the latent image.