Patents by Inventor Manfred Kiefer

Manfred Kiefer 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 for determining the fatigue of a pump rotor of a gas turbopump
    Patent number: 8751170
    Abstract: A method for determining the fatigue of the pump rotor of a gas turbopump comprises the following method steps: continuous determination of the rotational speed (n) of the pump rotor, determination of the local rotational speed maxima and minima of a temporal rotational speed profile under consideration, association of the rotational speed maxima and minima with each other to form pairs, determination of a pair fatigue value (L) for each of the rotational speed pairs, and accumulation of all pair fatigue values (L) to form a total fatigue value (Ltot). In this manner it is possible to determine the cyclic stress for the pump rotor of a vacuum pump and to include it in the calculation of a total fatigue value.
    Type: Grant
    Filed: January 16, 2008
    Date of Patent: June 10, 2014
    Assignee: Oerlikon Leybold Vacuum GmbH
    Inventors: Roland Blumenthal, Michael Froitzheim, Thomas Palten, Dieter Bohry, Manfred Kiefer
  • METHOD FOR DETERMINING THE FATIGUE OF A PUMP ROTOR OF A GAS TURBOPUMP
    Publication number: 20110046897
    Abstract: A method for determining the fatigue of the pump rotor of a gas turbopump comprises the following method steps: continuous determination of the rotational speed (n) of the pump rotor, determination of the local rotational speed maxima and minima of a temporal rotational speed profile under consideration, association of the rotational speed maxima and minima with each other to form pairs, determination of a pair fatigue value (L) for each of the rotational speed pairs, and accumulation of all pair fatigue values (L) to form a total fatigue value (Ltot). In this manner it is possible to determine the cyclic stress for the pump rotor of a vacuum pump and to include it in the calculation of a total fatigue value.
    Type: Application
    Filed: January 16, 2008
    Publication date: February 24, 2011
    Applicant: OERLIKON LEYBOLD VACUUM GMBH
    Inventors: Roland Blumenthal, Michael Froitzheim, Thomas Palten, Dieter Bohry, Manfred Kiefer