Patents by Inventor Ingemar Falkehag

Ingemar Falkehag 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).

  • Lignin preparation and method for its manufacture
    Patent number: 5288857
    Abstract: The invention relates to a lignin preparation prepared from black liquor derived from an alkali delignification process, such as the sulphate process, soda process or polysulphide process. The lignin preparation comprises mainly lignin and at least the major part of the sodium content of the lignin separated from the black liquor deriving from such processes has been replaced with calcium, therewith to provide a lignin preparation having improved properties which render the preparation more suitable for use as fuel.
    Type: Grant
    Filed: February 16, 1993
    Date of Patent: February 22, 1994
    Assignee: Ligno Tech Sweden AB
    Inventors: Wilhelm Aarsrud, Hans Bergstrom, Ingemar Falkehag