Patents by Inventor Darryl H Dawson

Darryl H Dawson 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).

  • Electrochemical gas sensor
    Patent number: 6746587
    Abstract: An electrochemical gas sensor comprises: a working electrode for exposure to a gas to be sensed; a counter electrode having an outer periphery; a reservoir for electrolyte; wick means providing a path for electrolyte to pass from the reservoir, around a first part or parts of the outer periphery of the counter electrode to provide electrolytic continuity between the counter electrode and the working electrode; and a gas diffusion means providing a path for gas to diffuse to or from a second part or parts of the outer periphery of the counter electrode.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: June 8, 2004
    Assignee: Alphasense Limited
    Inventors: John R. Saffell, Darryl H. Dawson
  • Electrochemical sensor for determining analyte in the presence of interferent and method of using the sensor
    Patent number: 6623619
    Abstract: Electrochemical sensor for determining analyte in the presence of interferent, particularly carbon monoxide in the presence of hydrogen. An electrochemical cell is designed so that current flow resulting from reference electrode potential shift caused by interferent cancels out the current flow caused by interferent at the working electrode. Another electrochemical cell corrects for interferent concentration using the potential difference between a reference electrode in contact with interferent and a referent electrode not affected by inteferent.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: September 23, 2003
    Assignee: Alphasense Limited
    Inventors: John R Saffell, Michael L Hitchman, Darryl H Dawson
  • Electrochemical gas sensor
    Publication number: 20020121438
    Abstract: An electrochemical gas sensor comprises: a working electrode for exposure to a gas to be sensed; a counter electrode having an outer periphery; a reservoir for electrolyte; wick means providing a path for electrolyte to pass from the reservoir, around a first part or parts of the outer periphery of the counter electrode to provide electrolytic continuity between the counter electrode and the working electrode; and a gas diffusion means providing a path for gas to diffuse to or from a second part or parts of the outer periphery of the counter electrode.
    Type: Application
    Filed: November 15, 2001
    Publication date: September 5, 2002
    Inventors: John R. Saffell, Darryl H. Dawson
  • Electrochemical sensor for determining analyte in the presence of interferent
    Publication number: 20020027086
    Abstract: Electrochemical sensor for determining analyte in the presence of interferent, particularly carbon monoxide in the presence of hydrogen. An electrochemical cell is designed so that current flow resulting from reference electrode potential shift caused by interferent cancels out the current flow caused by interferent at the working electrode. Another electrochemical cell corrects for interferent concentration using the potential difference between a reference electrode in contact with interferent and a referent electrode not affected by inteferent.
    Type: Application
    Filed: May 14, 2001
    Publication date: March 7, 2002
    Inventors: John R. Saffell, Michael L. Hitchman, Darryl H. Dawson