Patents by Inventor David D. Karran

David D. Karran 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).

  • Water-ammonia refrigeration system using solar energy
    Patent number: 4023375
    Abstract: Various interrelated ammonia solution, ammonia vapor, and liquid ammonia circuits are provided whereas solar radiation energy is used to boil such solution and produce ammonia vapor which is circulated into low pressure deabsorbing boilers to produce cooling effects suitable for air conditioning and food preservation. The intensity of the solar radiation is used to control alternative modes of operation.
    Type: Grant
    Filed: March 14, 1975
    Date of Patent: May 17, 1977
    Assignee: The University of Guyana
    Inventors: James C. V. Chinnappa, David D. Karran