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:
Feb. 08, 2005
Filed:
May. 23, 2001
An-gong Yeh, Broomall, PA (US);
Michael J. Eiseman, Swarthmore, PA (US);
Robert Paul Held, Newark, DE (US);
James L. Hohman, Newark, DE (US);
Dhiren V. Patel, Hockessin, DE (US);
Yia-ching Ray, Palisades Park, NJ (US);
Harry Joseph Spinelli, Wilmington, DE (US);
Sandra L. Witman, Wilmington, DE (US);
An-Gong Yeh, Broomall, PA (US);
Michael J. Eiseman, Swarthmore, PA (US);
Robert Paul Held, Newark, DE (US);
James L. Hohman, Newark, DE (US);
Dhiren V. Patel, Hockessin, DE (US);
Yia-Ching Ray, Palisades Park, NJ (US);
Harry Joseph Spinelli, Wilmington, DE (US);
Sandra L. Witman, Wilmington, DE (US);
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A process is provided in which a pigment is oxidated with ozone in an aqueous environment in which the mixture of ozone, water and pigment is subjected to a dispersive mixing operation; and/or the pH of the mixture is maintained in a range of 6-8, whereby the pigment is self-dispersing and preferably has an acid value of less than 3 μmoles/M. Pigments from this process and ink jet inks containing the self-dispersing pigments, are also provided.