Patents by Inventor Heng Siong Low

Heng Siong Low 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).

  • Inks and ink sets for improved performance and image quality
    Patent number: 8857963
    Abstract: Ink sets can include a plurality of aqueous inks. In one embodiment, a first ink can include a magenta dye and a magenta pigment. A second ink can include a cyan pigment, and a third ink can include a yellow pigment, wherein the second and third inks are substantially devoid of dye. The inks can independently include 2-pyrrolidone or 2-hydroxyethyl-2-pyrrolidone and an additional solvent selected from a glycol, a second pyrrolidone, and mixtures thereof. In another embodiment, an aqueous ink-jet ink can comprise a pigment and a liquid vehicle including water, 2-pyrrolidone, 2-hydroxyethyl-2-pyrrolidone, tetraethylene glycol, and 1,6-hexanediol.
    Type: Grant
    Filed: April 29, 2008
    Date of Patent: October 14, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: George Sarkisian, Keshava A. Prasad, Heng Siong Low
  • INKS AND INK SETS FOR IMPROVED PERFORMANCE AND IMAGE QUALITY
    Publication number: 20130286081
    Abstract: Ink sets can include a plurality of aqueous inks. In one embodiment, a first ink can include a magenta dye and a magenta pigment. A second ink can include a cyan pigment, and a third ink can include a yellow pigment, wherein the second and third inks are substantially devoid of dye. The inks can independently include 2-pyrrolidone or 2-hydroxyethyl-2-pyrrolidone and an additional solvent selected from a glycol, a second pyrrolidone, and mixtures thereof. In another embodiment, an aqueous ink-jet ink can comprise a pigment and a liquid vehicle including water, 2-pyrrolidone, 2-hydroxyethyl-2-pyrrolidone, tetraethylene glycol, and 1,6-hexanediol.
    Type: Application
    Filed: April 29, 2008
    Publication date: October 31, 2013
    Inventors: George Sarkisian, Keshava A. Prasad, Heng Siong Low