Patents by Inventor Michael B. Meinhardt

Michael B. Meinhardt 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).

  • Photochromic ink
    Patent number: 6022909
    Abstract: A photochromic phase change ink composition that contains (A) at least one selected polymeric and photochromic yellow phase change colorant and (B) a phase change ink carrier composition comprising (1) a resin selected from the group consisting of a urethane resin, a mixed urethane/urea resin and mixtures thereof; and (2) a mono-amide.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: February 8, 2000
    Assignee: Tektronix, Inc.
    Inventors: Michael B. Meinhardt, Randall R. Bridgeman
  • Magenta phase change ink formulation containing organic sulfonic acid
    Patent number: 6015847
    Abstract: A phase change ink composition comprising a phase change carrier composition, at least one compatible phase change magenta colorant material, and at least one organic sulfonic acid compound is disclosed. The sulfonic acid stabilizes the magenta dye.
    Type: Grant
    Filed: February 13, 1998
    Date of Patent: January 18, 2000
    Assignee: Tektronix, Inc.
    Inventors: Donald R. Titterington, Michael B. Meinhardt, Jeffery H. Banning, Clifford R. King
  • Phase change ink formulation containing a combination of a urethane resin, a mixed urethane/urea resin, a mono-amide and a polyethylene wax
    Patent number: 5994453
    Abstract: Phase change carrier compositions made from the combination of at least one urethane resin; at least one urethane/urea resin; at least one mono-amide; and at least one polyethylene wax are disclosed. The order of addition of the reactants to form the reactant product urethane resin and urethane/urea resin permits the tailoring or design engineering of desired properties.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: November 30, 1999
    Assignee: Tektronix, Inc.
    Inventors: Jeffrey H. Banning, Donald R. Titterington, Clifford R. King, Michael B. Meinhardt
  • Chiral shaped ink sticks
    Patent number: 5988805
    Abstract: An ink stick shape for use in a printer ink stick feed chute is disclosed wherein the opposing sides of the ink stick are tapered or angled from the horizontal so that at least one area intermediate the top and the bottom of the ink stick is a greater distance from the horizontal than the junction of the side walls and the bottom of the ink stick. The ink stick shape or geometry may be keyed to a particular color.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: November 23, 1999
    Assignee: Tektronix, Inc
    Inventor: Michael B. Meinhardt