Patents by Inventor Steffen Kuhlig

Steffen Kuhlig 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 solventless polycarbonate
    Patent number: 5191001
    Abstract: A three-step process for the production of solventless polycarbonate is disclosed. Accordingly, a mixture of two different oligocarbonates each prepared by the interfacial method, is prepared in the first process step. In a second step, the mixture is crystallized. The third step entails polycondensation. In an additional embodiment of the invention the first step uses a mixture of one oligocarbonate with a suitable monomer.
    Type: Grant
    Filed: October 10, 1991
    Date of Patent: March 2, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Steffen Kuhlig, Ralf Pakull, Ulrich Grigo, Peter Tacke, Dieter Freitag, Wolfgang Alewelt