Patents by Inventor David William Bennett

David William Bennett 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).

  • Tunable resonant cavities having particular isolating choke
    Patent number: 4122419
    Abstract: The invention relates to a resonant cavity device such as a magnetron oscillator which is tunable by means of a tuning plunger associated with sealing bellows. A volume defined at least in part by the bellows and producing a range of spurious responses as the tuning plunger is moved is isolated from the resonant cavity or cavities of the device by an isolating choke. The choke may take the form of an annulus having a major radius of 1/4 .lambda. (where .lambda. is the mid-frequency of the tuning range) attached either to the plunger or to the main body of the device and between the bellows and the resonant cavity or cavities.
    Type: Grant
    Filed: April 1, 1977
    Date of Patent: October 24, 1978
    Assignee: English Electric Valve Company Limited
    Inventors: Michael Barry Clive Brady, David William Bennett