Patents by Inventor James G. Crawford

James G. Crawford 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).

  • Hot water heating and defrost in a heat pump circuit
    Patent number: 4646537
    Abstract: An air-to-air heat pump system includes a refrigerant-liquid heat exchanger for heating a liquid. The system is capable of (1) space cooling, or (2) space heating, or (3) liquid heating without affecting the condition of an indoor space, or (4) simultaneous space cooling and liquid heating, or (5) simultaneous space heating and liquid heating, or (6) defrosting the outdoor heat exchanger without affecting the condition of an indoor space by utilizing heat supplied from a stored previously-heated liquid.
    Type: Grant
    Filed: October 31, 1985
    Date of Patent: March 3, 1987
    Assignee: American Standard Inc.
    Inventor: James G. Crawford