Patents by Inventor Luis F. Granda

Luis F. Granda 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).

  • Optical sensor for plotter pen verification
    Patent number: 5170047
    Abstract: An optical sensor for monitoring plotter pen performance by sensing the quality of lines drawn on a medium. An LED emitting green light beam is angularly directed toward an underlying line so as to reflect into an optical sensor which measures the print contrast ratio of a point on the line. Circuit means amplifies and filters the signal generated by the optical sensor.
    Type: Grant
    Filed: September 20, 1991
    Date of Patent: December 8, 1992
    Assignee: Hewlett-Packard Company
    Inventors: Robert W. Beauchamp, Isidre R. Martos, Luis F. Granda