Patents by Inventor Rolf-Jorg Dunker

Rolf-Jorg Dunker 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).

  • Etch solution and associated process for removal of protective metal layers and reaction deposits on turbine blades
    Patent number: 5248381
    Abstract: An etch solution for the removal of metallic layers, which provide protection against corrosion by hot gases, and of deposits resulting from hot gas reactions on turbine blades in power units comprising a salt solution and an inhibitor. The salt solution consists of a hydrogen sulfate in the amount of 5 to 45% by weight and the inhibitor is present in the amount of 0.5 to 10% by weight. The total amount of the hydrogen sulfate and inhibitor is present with at least 50% by weight of water based on the total etch solution. Using this etch solution, layers preferably comprising MCrAlY are removed from turbine blades comprised of alloys of Ti, Co or Ni.
    Type: Grant
    Filed: June 16, 1992
    Date of Patent: September 28, 1993
    Assignee: MTU Motoren-und Turbinen- Union Munchen GmbH
    Inventors: Rolf-Jorg Dunker, Holger Polanetzki, Martin Thoma