Patents by Inventor Vilmarie Lopez-Heroux

Vilmarie Lopez-Heroux 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).

  • Automatic compensation for toner concentration drift due to developer aging
    Patent number: 5410388
    Abstract: A method of maintaining consistent large solid area development by developing a large area test patch covering the image area of a photorececptor and detecting the lead edge and trail edge density of the test patch using a densitometer to measure reflectance. If a density differential between lead and trail edge density is detected, electrostatic parameters such as toner concentration, developer bias, and photoreceptor potential are adjusted to maintain constant large solid area development.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: April 25, 1995
    Assignee: Xerox Corporation
    Inventors: James M. Pacer, Brendan C. Casey, George F. Bergen, Patricia J. Weber, William M. OuYang, Vilmarie Lopez-Heroux