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:
Apr. 08, 2003
Filed:
Nov. 07, 2001
Maura A. Sweeney, Rochester, NY (US);
Thomas W. Smith, Penfield, NY (US);
Melvin D. Croucher, Rochester, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
Disclosed are pigment particles prepared by a process which comprises (a) preparing a solution of a polyalkylene oxide compound in water; (b) preparing a solution of a cationic dye in water; (c) admixing the solution containing the polyalkylene oxide compound with the solution containing the cationic dye to form a mixture; (d) adding to the mixture a solution containing a heteropolyacid in water, an alcohol, or a mixture thereof, thereby resulting in formation of pigment particles having an average particle diameter of no more than about 300 nanometers; and (e) after addition of the heteropolyacid to the mixture, neutralizing the mixture by addition of a base. Another embodiment of the present invention is directed to an ink composition comprising water and the aforementioned pigment particles.