Patents by Inventor Ulf Ullin

Ulf Ullin 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).

  • Overvoltage protection device mainly for vehicle-bound electronic equipment
    Patent number: 4347475
    Abstract: The present invention relates to an overvoltage protection device designed to protect electronic components against high energy transients. The protection device comprises a varistor, across which there is connected a voltage-dividing unit comprising a resistor and a voltage-limiting element, for example a varistor or a Zener diode. The voltage appearing across the voltage-limiting element controls the output signal of the protection device by being connected to the base of a transistor. The input signal to the transistor consists of the input signal of the circuit or the input signal voltage-divided across an input resistor.
    Type: Grant
    Filed: June 22, 1981
    Date of Patent: August 31, 1982
    Assignee: ASEA Aktiebolag
    Inventor: Ulf Ullin