Patents by Inventor Pratt Keith Francis Edwin

Pratt Keith Francis Edwin 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).

  • Multi-electrode gas sensors and methods of making and using them
    Patent number: 5918261
    Abstract: A resistive gas sensor has a gas sensing layer (11) overlaid as a layer on an array of electrodes (12, 14, 16) with unequal gaps (22, 24) between them. Signals from the different electrodes represent resistances in different regions of the sensing layer. The layer is applied as a succession of sub-layers, with application of each sub-layer modifying the microstructure of the preceding sub-layers. The resulting variation in microstructure within the sensing layer (11) is used for distinguishing between a reactive gas and a less reactive gas. The sensor has domestic applications for carbon monoxide detection.
    Type: Grant
    Filed: August 20, 1997
    Date of Patent: June 29, 1999
    Assignee: Capteur Sensors & Analysers, Ltd.
    Inventors: David Edward Williams, Pratt Keith Francis Edwin