Patents by Inventor Celia E. Fisher

Celia E. Fisher 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).

  • Monitoring of foreign object ingestion in engines
    Patent number: 4888948
    Abstract: The invention described in this specification relates to apparatus for monitoring the intake of foreign bodies and objects into an engine, particularly a gas turbine engine whereby sensors are located at or near the engine intake for detecting any electrostatic charge induced on the sensors by the passage of foreign bodies therepast. The specification particularly discloses an arrangement for a gas turbine engine in which sensors are provided in the exhaust duct and in the inlet duct and that signals from sensors in the inlet duct and exhaust duct are compared and contrasted.
    Type: Grant
    Filed: March 22, 1988
    Date of Patent: December 26, 1989
    Assignee: Stewart Hughes Limited
    Inventors: Celia E. Fisher, Roy Forfitt