Patents by Inventor Nigel Keith Hedges

Nigel Keith Hedges 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).

  • Device for measuring water quality
    Patent number: 7242001
    Abstract: The present invention relates to a device for measuring both the color and turbidity of a liquid sample. LEDs are used as light sources and reference detectors are included to control the output of the LEDs. The device is also capable of monitoring and correcting for fouling of optical surfaces. The device is intended to be installed in-line in a mains water supply line. The device can be used in domestic water meters or on sewage treatment sites to monitor the effluent discharged back to the river.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: July 10, 2007
    Assignee: Censar Technologies, Inc
    Inventors: Nigel Keith Hedges, John William Proctor, Brian Dominic MacCraith, Hugh Joseph Masterson
  • Wavelength stabilised laser source
    Publication number: 20040190571
    Abstract: There is provided an integrated wavelength-stabilised laser source comprising: a laser diode; a temperature-stabilising heat pump in thermal communication with the laser diode; and at least one detector, encapsulated within a hermetically sealed package comprising a window for passing light from the laser diode to the exterior of the package.
    Type: Application
    Filed: May 18, 2004
    Publication date: September 30, 2004
    Inventors: Stephen Sutton, Nigel Keith Hedges, Rainer Strzoda