Patents by Inventor Josef Wertli

Josef Wertli 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 generating and regulating welding currents
    Patent number: 4048467
    Abstract: Apparatus for generating and regulating welding currents, having primary and secondary circuits connected through a transformer, an anti-parallel connection of two thyristors in the primary circuit, a choke in parallel with this anti-parallel connection and means which shift the phase of the turn-on pulses in the case of a short-circuit on the secondary side and in switching on.
    Type: Grant
    Filed: January 8, 1976
    Date of Patent: September 13, 1977
    Assignee: Firma WkS-Schweisstechnik Willy Kalnbach
    Inventors: Josef Wertli, Paul Matter