Patents by Inventor Paul Opprecht

Paul Opprecht 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).

  • Welding head for resistance - welding machine
    Patent number: 4051343
    Abstract: A resistance-welding head having a vertical-axis rotor with a roller electrode attached to the lower end thereof. Current is supplied to the roller electrode by means of a mercury-filled interstice formed between the walls of a chamber within the rotor and a current-transmission rod disposed within the chamber. The rod may be provided with a bore for receiving the mercury and having a stopper which also serves as a mercury-level indicator.
    Type: Grant
    Filed: December 4, 1975
    Date of Patent: September 27, 1977
    Inventor: Paul Opprecht