Patents Assigned to Lexmark Internatonal, Inc.
  • Method for calibrating a drive motor for a toner metering device in an imaging apparatus
    Patent number: 8653773
    Abstract: In an imaging apparatus having a toner container, a method of periodically calibrating a back EMF constant Ke used in a speed control circuit of a DC motor used for driving for a toner metering device. To adjust the value of the back EMF constant Ke, the method uses a plurality of sampled back EMF measurements together with a calculated actual speed of rotation of the toner metering device as measured using motion sensor.
    Type: Grant
    Filed: February 2, 2012
    Date of Patent: February 18, 2014
    Assignee: Lexmark Internatonal, Inc.
    Inventors: Timothy Leo Brown, Totsuka Kenji
  • Photoconductor with charge generation binder blend
    Patent number: 6042980
    Abstract: Charge generation layers for photoconductors comprise a binder and a charge generation compound, wherein the binder comprises a blend of polyvinylbutyral polymer and at least one resin which improves at least one electrical characteristic of a photoconductor in which the charge generation layer is included. Photoconductors comprise the charge generation layer in combination with a substrate and a charge transport layer.
    Type: Grant
    Filed: July 21, 1998
    Date of Patent: March 28, 2000
    Assignee: Lexmark Internatonal, Inc.
    Inventors: Laura Lee Kierstein, Kasturi Rangan Srinivasan