Patents by Inventor Natalie K. Harris

Natalie K. Harris 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).

  • Gas sensor
    Patent number: 4887455
    Abstract: A gas sensor has a layer of a semiconductor organic polymer, such as polypyrrole which is exposed to a gas to be detected. An alternating electric signal of varying frequency is applied to the sensor by an analyser, which detects the change in impedance characteristics of the sensor. The characteristics obtained are compared by microcomputer with reference characterisitcs stored in a memory. The resulting difference spectra depend on the gas in contact with the sensor and so the gas can be detected.
    Type: Grant
    Filed: April 5, 1988
    Date of Patent: December 19, 1989
    Assignee: Cogent Limited
    Inventors: Peter A. Payne, Jon G. Bartlett, Natalie K. Harris