Patents by Inventor Jack Hammack

Jack Hammack 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).

  • Method and composition for improving the energy efficiency of heat pump systems
    Patent number: 4963280
    Abstract: A method of improving the efficiency of a heat pump system comprising introducing into the system a polar compound which is liquid under said systems operating conditions.
    Type: Grant
    Filed: January 29, 1988
    Date of Patent: October 16, 1990
    Assignees: Charles Henry Tully-Wilkins, Jr., Linda Ann Tully-Wilkins Frazier
    Inventors: Charles H. T. Wilkins, deceased, Jack Hammack, Charles B. Thompson