Patents by Inventor Ashok Vishnu Gangal

Ashok Vishnu Gangal 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).

  • Ink jet ink containing wetting agent
    Patent number: 5981623
    Abstract: A jet printing ink composition which results in reduced drop misdirection and missing nozzles is provided. The aqueous-based ink composition includes at least one colorant; a wetting agent; and a co-solvent comprising a substituted or unsubstituted lactam, an amide, or mixtures thereof.
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: November 9, 1999
    Assignee: Lexmark International, Inc.
    Inventors: Sandra Helton McCain, Terence Edward Franey, Ashok Vishnu Gangal, Agnes Kam Zimmer
  • Process for preparing pigment dispersions used in inks
    Patent number: 5891231
    Abstract: A method for making a dispersion for an ink, and the ink obtained from this method. The method comprises preparing a dispersion comprising colorant agglomerates and reducing the agglomerate size using a plastic medium. The dispersion is formed by dispersing the colorant agglomerates in a dispersant, optionally in the presence of a liquid carrier such as distilled or deionized water. The colorant in the dispersion may be a carbon black, yellow, cyan, or magenta pigment, or a combination thereof. The plastic medium is preferably a grinding medium, such as polystyrene.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: April 6, 1999
    Assignee: Lexmark International Inc.
    Inventors: Robin Gant Gnerlich, Anna Marie Pearson, Ashok Vishnu Gangal