Patents by Inventor John Harry Gustafsson

John Harry Gustafsson 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: 3973594
    Abstract: A mixing valve for hot and cold water has two control levers for single hand operation each governing the position of a valve plug. The one lever controls the flow rate of the hot water and the other the flow rate of the cold water. The temperature of the mixed water is regulated by change of the relative positions of the levers and its flow rate is controlled by movement of the levers in unison. Such movement will leave the temperature unaffected because the levers actuate the plugs over cam means and the control surfaces between those means and the plugs yield a logarithmic relationship between the flow area at each plug and the corresponding lever movement.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: August 10, 1976
    Assignee: IFO AB
    Inventors: John Harry Gustafsson, Tord Egron Henry Froberg