Patents by Inventor Keshava Anand Prasad

Keshava Anand Prasad has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Pigmented ink set and process for alleviating bleed in printed elements using carboxylic acid additives
    Patent number: 5713993
    Abstract: Bleed between two adjacent pigmented inks on a printing medium is reduced. The first ink has at least one neutralized carboxylic acid group, neutralized amine, or a quaternized amine group; and the second ink contains a polymeric dispersant having at least one sulfonate or phosphonate group, and a carboxylic acid additive having a pKa of up to 3.5.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: February 3, 1998
    Assignee: E.I. du Pont De Nemours and Company
    Inventors: Loretta Ann Grezzo Page, Milan Bohuslav Bednarek, Zeying Ma, Keshava Anand Prasad