Patents by Inventor Hagen Hartel

Hagen Hartel 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).

  • Apparatus for the current limiting interruption of currents at high voltages
    Patent number: 4005340
    Abstract: A circuit arrangement for the current-limiting interruption of high-voltage direct and alternating currents including a commutation switch connected in the high-voltage main, a residual current switch connected to the commutation switch and a shunt path connected in parallel with the commutation switch and including a temperature dependent resistor with a strongly positive temperature coefficient and a spark path connected in series with the resistor. The firing voltage of the spark path is such that the spark path responds after a predetermined arc voltage has been reached at the commutation switch to cause the current to commutate to the shunt path.
    Type: Grant
    Filed: May 9, 1975
    Date of Patent: January 25, 1977
    Assignee: Dieter Kind
    Inventor: Hagen Hartel