Patents by Inventor Klaus Frielingsdorf

Klaus Frielingsdorf 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).

  • Production of carbon fibre
    Patent number: 5340511
    Abstract: A method of producing carbon fiber includes the steps of providing a solution of a coal-derived material in a solvent, typically dimethylformamide, adding polyethylene oxide having a molecular weight of at least 3.times.10.sup.6 daltons to the solution to provide a spinning solution, spinning the spinning solution into a fiber and causing the fiber to gel, typically by contacting it with a gelling solvent. The coal-derived material will have a composition, free of solvent, of 70 to 91 percent by mass of carbon, 2 to 6 percent by mass of hydrogen and 3 to 20 percent by mass of oxygen.
    Type: Grant
    Filed: August 16, 1993
    Date of Patent: August 23, 1994
    Assignee: Enerkom (Proprietary Limited
    Inventors: David L. Morgan, Vladimir Cukan, Klaus Frielingsdorf