Patents by Inventor Karl-Heiner Ettwein

Karl-Heiner Ettwein 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 instrument for releasing a bracket
    Patent number: 5040975
    Abstract: An improved method is proposed for releasing brackets from bonded joints whereby also ceramic brackets can be removed. Herein, the layer of bonding agent is subjected to pulse-shaped heat input by transfer of heat from an instrument to the bracket, with a safety device allowing only a suitable amount of heat for the respective type of bracket to be transferred.
    Type: Grant
    Filed: May 9, 1990
    Date of Patent: August 20, 1991
    Assignee: Dentaurum J. P. Winkelstroeter KG
    Inventors: Karl-Heiner Ettwein, Friedrich-Wilhelm Rohlcke, Heinz Bauerle, Karl-Heinz Reichelt, Bernhard Bazner