Patents by Inventor Keith M. Chirgwin

Keith M. Chirgwin 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).

  • Dynamoelectric machine
    Patent number: 4039910
    Abstract: A dynamolectric machine stator has a primary winding for single phase alternating current input and a secondary winding for polyphase alternating current to be supplied from output terminals. The secondary winding is connected such that at least two frequencies are provided at the terminals. The rotor has two windings thereon for excitation, one being excitable for one frequency output and the other rotor winding being excitable for another frequency output at the secondary terminals. Another secondary winding may be provided on the stator to obtain a desired output terminal voltage at one of the selected frequencies.
    Type: Grant
    Filed: December 5, 1975
    Date of Patent: August 2, 1977
    Assignee: The Garrett Corporation
    Inventor: Keith M. Chirgwin
  • Method of converting phase and frequency using a dynamo-electric machine
    Patent number: 4039922
    Abstract: A dynamoelectric machine stator has a primary winding for single phase alternating current input and a secondary winding for polyphase alternating current to be supplied from output terminals. The secondary winding is connected such that at least two frequencies are provided at the terminals. The rotor has two windings thereon for excitation, one being excitable for one frequency output and the other rotor winding being excitable for another frequency output at the secondary terminals. Another secondary winding may be provided on the stator to obtain a desired output terminal voltage at one of the selected frequencies.
    Type: Grant
    Filed: December 5, 1975
    Date of Patent: August 2, 1977
    Assignee: The Garrett Corporation
    Inventor: Keith M. Chirgwin