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:
May. 27, 1997
Filed:
Sep. 29, 1995
Orrin D Christy, North Tonawanda, NY (US);
John E Pickett, E. Amherst, NY (US);
Leo Swanson, Niagara Falls, NY (US);
Kevin J Hook, Grand Island, NY (US);
Moore Business Forms, Inc., Grand Island, NY (US);
Abstract
A toner composition for developing an electrostatic latent image comprising a base toner, which is a blend of a polymeric resin and a colorant, and one or more of a lubricating agent, a flowability agent, a charge-stabilizing agent, and a conductive agent, which has certain electrical characteristics. The base toner has a mean particle diameter (D.sub.50) of 7 to 18 microns, and a bulk resistivity of greater than 10.sup.12 ohm-cm. The toner composition is prepared by blending a polymeric resin with a colorant and then blending a dry powder lubricating agent, and optionally other additives, with the base toner. The toner composition is charged by being disposed in an electrostatic fluidized bed from which the toner particles are levitated by air and then subjected to field charging created by a high voltage corona generating device contained within the bed.