Patents by Inventor Keith Drysdale

Keith Drysdale 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 apparatus for heating a spa
    Patent number: 5226408
    Abstract: A method and apparatus for heating water in a spa which has a plurality of venturi jets, a hosing which includes a plurality of venturi jets and a high speed pump which circulates water through the housing and the venturi jets in the spa and a water thermostat. The thermostat is positioned in the water of the spa and connected to the high speed pump such that the high speed pump is activated to propel water through the venturi jets at high speed and thus heat it whenever the water temperature falls below a preset level.
    Type: Grant
    Filed: April 14, 1992
    Date of Patent: July 13, 1993
    Assignee: K. D. Heating Systems, Inc.
    Inventor: Keith Drysdale