Patents by Inventor John E. Leuthard

John E. Leuthard 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).

  • Energy efficient water heater
    Patent number: 4324207
    Abstract: Apparatus is disclosed for heating hot water in separate tank stages, and according to predetermined cyclic time patterns. A first smaller hot water tank is heated to a first elevated temperature under thermostatic control, and a second larger hot water tank is heated to a second lower temperature under thermostatic control and to a third elevated temperature under thermostatic control during a predetermined time cycle; provision is made for demand override of the heating mechanism of the second tank.
    Type: Grant
    Filed: July 25, 1980
    Date of Patent: April 13, 1982
    Inventor: John E. Leuthard