Patents by Inventor David Malcom Howie

David Malcom Howie 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).

  • Pulsed antenna capacitive touch switch
    Patent number: 8203466
    Abstract: A capacitive touch switch suitable for use in areas with high environmental and electrical contamination employs a complex excitation signal that is demodulated to better distinguish it from environmental effects. Improved discrimination allows these sensed signals to be offset against a signal developed by a reference electrode to allow the system to operate robustly with contamination on the electrodes that would otherwise trigger or obscure pulses.
    Type: Grant
    Filed: April 18, 2008
    Date of Patent: June 19, 2012
    Assignee: Illinois Tool Works Inc.
    Inventors: Jeffrey P. Rudd, Levi G. Fox, David Malcom Howie, Thomas A. Mignone, James Pellegrini
  • PULSED ANTENNA CAPACITIVE TOUCH SWITCH
    Publication number: 20100109917
    Abstract: A capacitive touch switch suitable for use in areas with high environmental and electrical contamination employs a complex excitation signal that is demodulated to better distinguish it from environmental effects. Improved discrimination allows these sensed signals to be offset against a signal developed by a reference electrode to allow the system to operate robustly with contamination on the electrodes that would otherwise trigger or obscure pulses.
    Type: Application
    Filed: April 18, 2008
    Publication date: May 6, 2010
    Inventors: Jeffrey P. Rudd, Levi G. Fox, David Malcom Howie, Thomas A. Mignone, James Pellegrini