Patents by Inventor Udo Oels

Udo Oels 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 production of aromatic polycarbonates, aromatic polyester carbonates and aromatic polyesters with p containing catalyst and mixture of hydrocarbons
    Patent number: 4973652
    Abstract: The invention relates to a process for the production of aromatic polycarbonates, aromatic polyester carbonates and aromatic polyesters by the known two-phase interfacial method which is characterized in that a mixture of aromatic hydrocarbons with alkanes and/or cycloalkanes is used as the organic phase and in that phosphines or phosphine oxides are used as the catalysts.
    Type: Grant
    Filed: June 6, 1989
    Date of Patent: November 27, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Ebert, Rolf-Volker Meyer, Rolf Dhein, Udo Oels
  • Preparation of aromatic polycarbonates, aromatic polyester carbonates and aromatic polyesters with organic phase comprising mixture of hydrocarbons
    Patent number: 4946927
    Abstract: The present invention relates to a process for the preparation of aromatic polycarbonates, aromatic polyester carbonates and aromatic polyesters by the known two phase interface process, which is characterized in that the organic phase used is a mixture of aromatic hydrocarbons with alkanes and/or cycloalkanes.
    Type: Grant
    Filed: March 30, 1989
    Date of Patent: August 7, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Ebert, Rolf-Volker Meyer, Rolf Dhein, Udo Oels
  • Process for the preparation of shaped articles of stabilized polycarbonate by the devolatilizing injection-moulding or devolatilizing extrusion process
    Patent number: 4627949
    Abstract: The present invention relates to a process for the preparation of polycarbonate shaped articles from polycarbonates stabilized with phosphanes by the devolatilizing injection-moulding or devolatilizing extrusion process.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: December 9, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Dhein, Helmut M. Meier, Hans J. Meissner, Klaus Kircher, Udo Oels
  • Process for separating solid 1,5- and/or 1,8-dinitroanthraquinone and liquid nitrobenzene
    Patent number: 4389344
    Abstract: A process and an equipment for obtaining dry 1,5- and/or 1,8-dinitroanthraquinone from suspensions which contain liquid nitrobenzene whereby in a first stage solid 1,5- and/or 1,8-dinitroanthraquinone with a content of less than 30% by weight of nitrobenzene is separated off mechanically from the suspension at elevated temperature and whereby in a second stage the residued nitrobenzene is removed from the separated 1,5- and/or 1,8-dinitroanthraquinone by lowering the pressure during which the temperature falls.
    Type: Grant
    Filed: November 29, 1979
    Date of Patent: June 21, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Axel Schaefer, Werner Motika, Wolfgang Bender, Jorn Todt, Udo Oels