Patents by Inventor Rolf Sander

Rolf Sander 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).

  • Fluorocyclohexane derivatives, and liquid-crystalline medium
    Patent number: 6056895
    Abstract: The invention relates to fluorocyclohexane derivatives of the formula I ##STR1## in which n, m, R.sup.1, X.sup.1, X.sup.2, Z.sup.1, Z.sup.2, A.sup.1 and Y are as defined above.
    Type: Grant
    Filed: April 7, 1998
    Date of Patent: May 2, 2000
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Peer Kirsch, Kazuaki Tarumi, Joachim Krause, Rolf Sander, Andreas Ruhl
  • Cutter drum
    Patent number: 4119350
    Abstract: A screw-type cutter drum is provided having helical ribs on the drum body with cutter picks on the ribs and on the end of the drum. The cutter picks at the end of the drum are arranged in sets spaced apart to coincide with the ends of the ribs and the cutter picks of each set are equally spaced apart angularly and placed at different radial distances from the axis which decrease in the direction of rotation.
    Type: Grant
    Filed: May 12, 1977
    Date of Patent: October 10, 1978
    Assignees: Gebr. Eickhoff, Maschinenfabrik und Eisengiesserei, m.b.H., Bergwerksverband, G.m.b.H.
    Inventors: Rolf Sander, Klaus Oberste-Beulmann