Patents by Inventor Detlev Lettau

Detlev Lettau 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).

  • Shield cap for a shield-type mining support
    Patent number: 8215876
    Abstract: A shield cap for a shield-type support for underground mining includes a cap plate, with reception devices for the connection of hydraulic cylinder heads to the shield cap, and a supporting structure welded below the cap plate and having a plurality of longitudinal spars. At least two of the longitudinal spars include substantially I-profile struts having an upper profile chord, a lower profile chord and a middle chord running perpendicularly to the two profile chords. The distance between the upper and the lower profile chord decreases at least over a part length of each strut.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: July 10, 2012
    Assignee: Caterpillar Global Mining Europe GmbH
    Inventors: Siamak Onsori, Stefan Hengstler, Detlef Hahn, Sebastian M. Mundry, Detlev Lettau
  • SHIELD CAP FOR A SHIELD-TYPE MINING SUPPORT
    Publication number: 20110142551
    Abstract: A shield cap for a shield-type support for underground mining includes a cap plate, with reception devices for the connection of hydraulic cylinder heads to the shield cap, and a supporting structure welded below the cap plate and having a plurality of longitudinal spars. At least two of the longitudinal spars include substantially I-profile struts having an upper profile chord, a lower profile chord and a middle chord running perpendicularly to the two profile chords. The distance between the upper and the lower profile chord decreases at least over a part length of each strut.
    Type: Application
    Filed: June 19, 2009
    Publication date: June 16, 2011
    Applicant: BUCYRUS EUROPE GMBH
    Inventors: Siamak Onsori, Stefan Hengstler, Detlef Hahn, Sebastian M. Mundry, Detlev Lettau