Patents by Inventor Paul-Christian Fiedler

Paul-Christian Fiedler 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).

  • Process for the preparation of intermediates
    Patent number: 5099040
    Abstract: A new process for the preparation of 1-chloro-2-(1-chloro-cyclopropyl)-3-(2-chloro-phenyl)-propan-2-ol of the formula ##STR1## and/or 2-(1-chloro-cyclopropyl)-2-(2-chloro-benzyl)-oxirane of the formula ##STR2## comprising a) reacting in a first step, 2-chloro-benzyl chloride of the formula ##STR3## with comminuted magnesium in the presence of a mixture of toluene and tetrahydrofuran, in which the ratio of toluene to tetrahydrofuran is between 65:35 and 95:5 parts by weight, at a temperature between 0.degree. C. and 100.degree. C.
    Type: Grant
    Filed: August 23, 1991
    Date of Patent: March 24, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Winfried Rosen, Paul-Christian Fiedler, Gotz Blume
  • Hydrogenation of unsaturated polymers containing nitrile groups
    Patent number: 5034469
    Abstract: Hydrogenation products of olefinically unsaturated polymers having nitrile groups prepared in the presence of ruthenium catalysts in a solvent comprising a low-molecular ketone and a secondary or tertiary C.sub.3 -C.sub.6 -alcohol by hydrogenation, can be processed to vulcanizates with improved compression set values.
    Type: Grant
    Filed: June 18, 1990
    Date of Patent: July 23, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmuth Buding, Joachim Thormer, Wilfried Nolte, Johann Hohn, Paul-Christian Fiedler, Thomas Himmler