Patents by Inventor Frank N. Wall

Frank N. Wall 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).

  • Patent number: 5157936
    Abstract: A high capacity refrigerant apparatus is made up of a heat exchanger which receives refrigerant from the system to be drained in heat exchange relation to a coolant from a vapor compressor circuit, and a liquid pump discharges the refrigerant from the heat exchanger so long as the liquid refrigerant in the heat exchanger remains at a particular level; otherwise, the refrigerant is drawn through a second vapor compressor circuit and completely condensed prior to discharge. In a modified form, a lower capacity refrigerant reclamation apparatus, a reciculating coolant tube vaporizes a limited amount of refrigerant and returns it back through the heat exchanger so as not to require a separate vapor compressor system for the heat exchange cooling medium.
    Type: Grant
    Filed: July 25, 1991
    Date of Patent: October 27, 1992
    Inventor: Frank N. Wall