Patents by Inventor Dietmar Hettkamp

Dietmar Hettkamp 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).

  • Establishing a connection between steam generator heating surfaces and a collector and/or distributor
    Patent number: 7533633
    Abstract: The invention relates to the establishing of a connection between steam generator heating surfaces made of austenitic materials and a collector and/or distributor made of martensitic or ferritic materials or of a nickel-base alloy. In order to extend the expectation of serviceable life of the connection, the pipe nipple of the reservoir used as a collector or distributor is made of a nickel-base alloy and directly welded to the collector wall in such a manner that an axial gap remains between the connecting branch and the collector wall. In a connection of the aforementioned type between steam generator heating surfaces made of austenitic materials and the pipe nipple or the pipe nipple and the collector made of martensitic materials, the coefficient of expansion of the material of the pipe nipple has a particularly good effect upon the serviceable life of the entire connection.
    Type: Grant
    Filed: July 4, 2005
    Date of Patent: May 19, 2009
    Assignee: Hitachi Power Europe GmbH
    Inventors: Martin Becker, Dietmar Hettkamp, Ralf-Udo Husemann
  • Establishing a Connection Between Steam Generator Heating Surfaces and a Collector and/or Distributor
    Publication number: 20070221144
    Abstract: The invention relates to the establishing of a connection between steam generator heating surfaces made of austenitic materials and a collector and/or distributor made of martensitic or ferritic materials or of a nickel-base alloy. In order to extend the expectation of serviceable life of the connection, the pipe nipple of the reservoir used as a collector or distributor is made of a nickel-base alloy and directly welded to the collector wall in such a manner that an axial gap remains between the connecting branch and the collector wall. In a connection of the aforementioned type between steam generator heating surfaces made of austenitic materials and the pipe nipple or the pipe nipple and the collector made of martensitic materials, the coefficient of expansion of the material of the pipe nipple has a particularly good effect upon the serviceable life of the entire connection.
    Type: Application
    Filed: July 4, 2005
    Publication date: September 27, 2007
    Inventors: Martin Becker, Dietmar Hettkamp, Ralf-Udo Husemann