Patents by Inventor James P. Fraser

James P. Fraser 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).

  • Stirling engine power control
    Patent number: 4395881
    Abstract: A power control method and apparatus for a Stirling engine including a valved duct connected to the junction of the regenerator and the cooler and running to a bypass chamber connected between the heater and the cylinder. An oscillating zone of demarcation between the hot and cold portions of the working gas is established in the bypass chamber, and the engine pistons and cylinders can run cold.
    Type: Grant
    Filed: February 17, 1981
    Date of Patent: August 2, 1983
    Assignee: Mechanical Technology Incorporated
    Inventor: James P. Fraser
  • Acoustic telephone
    Patent number: D382273
    Type: Grant
    Filed: March 8, 1996
    Date of Patent: August 12, 1997
    Inventor: James P. Fraser