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:
Dec. 18, 2007
Filed:
Mar. 21, 2005
Maria N. V. MC Dougall, Burlington, CA;
Richard P. N. Veregin, Mississauga, CA;
Vladislav Skorokhod, Mississauga, CA;
Mary L. MC Stravick, Fairport, NY (US);
Deepak R. Maniar, Webster, NY (US);
Paul W. Morehouse, Jr., Webster, NY (US);
Rachael L. MC Grath, Churchville, NY (US);
Jackie Parker, Mississauga, CA;
Shigang Qui, Toronto, CA;
Mary B. Schlitzer, Rochester, NY (US);
Michael D. Thompson, Rochester, NY (US);
Christopher M. Pattison, Rochester, NY (US);
Thomas C. Dombroski, Rochester, NY (US);
Maria N. V. Mc Dougall, Burlington, CA;
Richard P. N. Veregin, Mississauga, CA;
Vladislav Skorokhod, Mississauga, CA;
Mary L. Mc Stravick, Fairport, NY (US);
Deepak R. Maniar, Webster, NY (US);
Paul W. Morehouse, Jr., Webster, NY (US);
Rachael L. Mc Grath, Churchville, NY (US);
Jackie Parker, Mississauga, CA;
Shigang Qui, Toronto, CA;
Mary B. Schlitzer, Rochester, NY (US);
Michael D. Thompson, Rochester, NY (US);
Christopher M. Pattison, Rochester, NY (US);
Thomas C. Dombroski, Rochester, NY (US);
Xerox Corporation, Norwalk, CT (US);
Abstract
A developer includes black toner particles and carrier particles, the black toner particles including at least one binder, at least one black colorant and one or more external additives, wherein the toner particles comprise from about 7 to about 15 pph of the developer, and wherein the toner particles exhibit a triboelectric charge of from about −25 to about −50 μC/g at toner particle concentrations of about 7 to about 15 pph of the developer. The developer is ideally suited for use in a high speed (greater than 100 prints per minute) semiconductive magnetic brush development apparatus. Preferably, the black toner particles include a styrene acrylate binder, and the external additives include from about 1.3 to about 2.1% by weight of the toner particles of a first silica having an average particle size of from about 35 to about 45 nm, from about 0.5 to about 1.0% by weight of the toner particles of a second silica having an average particle size of from about 135 to about 160 nm, and from about 0.2 to about 0.5% by weight of the toner particles of a titania having an average particle size of from about 35 to about 45 nm, with an external additive toner surface area coverage of from about 25 to about 45%.