Patents by Inventor Simon M. Derricutt

Simon M. Derricutt 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).

  • Discriminating paper sensor
    Patent number: 6633052
    Abstract: A paper sensor uses two sample and hold circuits which are fired by the phase and antiphase of an oscillator that also drives an infrared light emitting diode (LED). These circuits sample the output from a phototransistor. If the outputs from the phototransistor are different when the LED is lit and unlit, then a comparator will give an output, thus synchronously filtering out unwanted infrared light that may cause a false paper reading.
    Type: Grant
    Filed: January 11, 2002
    Date of Patent: October 14, 2003
    Assignee: Xerox Corporation
    Inventors: Alan Walters, Simon M. Derricutt
  • Discriminating paper sensor
    Publication number: 20030132403
    Abstract: A paper sensor uses two sample and hold circuits which are fired by the phase and antiphase of an oscillator that also drives an infrared light emitting diode (LED). These circuits sample the output from a phototransistor. If the outputs from the phototransistor are different when the LED is lit and unlit, then a comparator will give an output, thus synchronously filtering out unwanted infrared light that may cause a false paper reading.
    Type: Application
    Filed: January 11, 2002
    Publication date: July 17, 2003
    Applicant: Xerox Corporation
    Inventors: Alan Walters, Simon M. Derricutt