Patents Assigned to Welldone Engineering GmbH
  • Apparatus for the transmission of information in a drill string
    Patent number: 5806612
    Abstract: In a drill string pressure pulses are generated by expansion and constriction of an elastic body to transmit information along the drill string.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: September 15, 1998
    Assignees: DMT-Gesellschaft Fur Forschung Und Prufung MBH, Welldone Engineering GmbH
    Inventors: Werner Vorhoff, Dieter Wrobel, Dagobert Feld