Patents by Inventor Hellmut Tietze

Hellmut Tietze 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).

  • Device for changing the temperature of a room
    Patent number: 4719763
    Abstract: A device for changing the temperature in a room includes: a refrigerant circuit including a refrigerant compressor, a condenser and an evaporator for receiving condensed refrigerant from the condenser; a cooling circuit including a cold accumulator for containing a cooling liquid, a heat exchanger for receiving cooling liquid from the cold accumulator and a pump for circulating cooling liquid through the cooling circuit; the evaporator being received in the cold accumulator to generate and accumulate cold in the cooling liquid by absorbing heat from the cooling liquid; a fan arranged to circulate air in the room through the heat exchanger for cooling the air; a control system arranged to start operation of the fan and the cooling circuit in response to a person entering the room and to stop operation of the fan and the cooling circuit in response to a person leaving the room; and a timer arranged to stop operation of the operating refrigerating circuit when a predetermined amount of cold has been generated an
    Type: Grant
    Filed: November 13, 1986
    Date of Patent: January 19, 1988
    Inventor: Hellmut Tietze