Patents by Inventor Keith P. Rodger

Keith P. Rodger 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).

  • Heat machine
    Patent number: 5251448
    Abstract: A heat machine comprising a displacer reciprocating within a housing. The displacer incorporates first and second independent, co-axial, overlapping regenerators. A first working volume is formed between the displacer and the housing at a hot end of the heat machine. Second and third working volumes are formed between the displacer and the housing at a cold end of the heat machine. A partition separates the second and third working volumes. A gas flow path exists from the first working volume to the third working volume via the first regenerator, the second working volume, a gas path within the partition, and the second regenerator.
    Type: Grant
    Filed: March 10, 1992
    Date of Patent: October 12, 1993
    Assignee: Lucas Industries, public limited company
    Inventor: Keith P. Rodger
  • Apparatus for controlling the flow of gas
    Patent number: 4771808
    Abstract: An electro-magnetically controlled gas valve has an armature supported by a flexible diaphragm, with the armature and diaphragm being in the magnetic flux path of the electro-magnetic coil, and the armature carrying a resilient seal for engagement with a conical seat forming part of the gas flow path through the valve.
    Type: Grant
    Filed: March 11, 1987
    Date of Patent: September 20, 1988
    Assignee: Alexander Controls Limited
    Inventor: Keith P. Rodger