Patents by Inventor Friedrich Oeffinger

Friedrich Oeffinger 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).

  • Method and apparatus for plasma welding with low jet angle divergence
    Patent number: 6982395
    Abstract: The invention relates to a method and an apparatus for plasma welding. A free microwave-induced plasma jet is generated by the following steps. Microwaves are generated in a high-frequency microwave source. The microwaves are guided in a wave guide. A process gas is introduced at a pressure of p?1 bar into a microwave-transparent tube, which comprises a gas inlet opening and a gas outlet opening, the process gas being introduced through the gas inlet opening into the microwave-transparent tube in such a way that it has a tangential flow component. A plasma is generated in the microwave-transparent tube by electrodeless ignition of the process gas. The plasma jet is produced by the introduction of the plasma into a working space through a metallic expansion nozzle arranged at the gas outlet opening of the tube.
    Type: Grant
    Filed: March 6, 2002
    Date of Patent: January 3, 2006
    Assignee: MTU Aero Engines GmbH
    Inventors: Erwin Bayer, Philip Betz, Joerg Hoeschele, Friedrich Oeffinger, Juergen Steinwandel
  • Method for plasma welding
    Publication number: 20040149700
    Abstract: The invention relates to a plasma welding process by means of a free microwave-induced plasma jet, which is generated by means of the following process steps:
    Type: Application
    Filed: February 13, 2004
    Publication date: August 5, 2004
    Inventors: Erwin Bayer, Philip Betz, Joerg Hoeschele, Friedrich Oeffinger, Juergen Steinwandel