Patents by Inventor Linda C. Uhlir-Tsang

Linda C. Uhlir-Tsang 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).

  • Use of additives to reduce puddling in inkjet inks
    Publication number: 20040055507
    Abstract: A puddling additive comprising an anionic, polar group and a C6-C30 hydrocarbon tail for use in reducing puddling in an inkjet ink. The anionic, polar group is a carboxylate or phosphate group and the C6-C30 hydrocarbon tail is a saturated or unsaturated C6-C30 hydrocarbon chain. An inkjet ink comprises a puddling additive, a dye, and an ink vehicle. A method of reducing puddling in an inkjet ink is also disclosed. The method comprises adding the puddling additive to the inkjet ink.
    Type: Application
    Filed: September 24, 2002
    Publication date: March 25, 2004
    Inventors: Linda C. Uhlir-Tsang, John R. Moffatt, Mary E. Austin
  • Nonionic additives to control puddling in inkjet inks
    Publication number: 20040055506
    Abstract: A puddling additive comprising a nonionic, polar group and a C6-C30 hydrocarbon tail for use in reducing puddling in an inkjet ink. The inkjet ink also comprises a dye and an ink vehicle. A method of reducing puddling in an inkjet ink is also disclosed. The method comprises adding a puddling additive to the inkjet ink, wherein the puddling additive comprises a nonionic, polar group and a C6-C30 hydrocarbon tail.
    Type: Application
    Filed: September 24, 2002
    Publication date: March 25, 2004
    Inventors: Linda C. Uhlir-Tsang, John R. Moffatt
  • Precursor electrical pulses to improve inkjet decel
    Patent number: 6669317
    Abstract: A print command is received and a short, single, electrical precursor pulse is generated to preheat the ink components near the surface of the heating element. The precursor pulse returns precipitated ink components near the resistor to solution. For best results, the precursor pulse occurs approximately 1.50 microseconds prior to the main drive pulse even though other times, such as 1.00 microsecond, can produce adequate results. The main drive pulse then occurs to print the required information.
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: December 30, 2003
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Thomas W. Linder, Linda C. Uhlir-Tsang
  • Precursor electrical pulses to improve inkjet decel
    Publication number: 20020118237
    Abstract: A print command is received and a short, single, electrical precursor pulse is generated to preheat the ink components near the surface of the heating element. The precursor pulse returns precipitated ink components near the resistor to solution. For best results, the precursor pulse occurs approximately 1.50 microseconds prior to the main drive pulse even though other times, such as 1.00 microsecond, can produce adequate results. The main drive pulse then occurs to print the required information.
    Type: Application
    Filed: February 27, 2001
    Publication date: August 29, 2002
    Inventors: Thomas W. Linder, Linda C. Uhlir-Tsang