Patents by Inventor Gerhard Dahlmann

Gerhard Dahlmann 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 delignification of cellulose fiber raw materials using alcohol and alkali
    Patent number: 5470433
    Abstract: A process for the delignification of cellulose fiber plant raw material for the production of pulp using separate impregnating and delignifying stages, each using alcohol and alkali. The process may be carried out in batch or in a continuous process. Less alcohol is used in the delignification stage than in the delignification stage. The pulp produced has very good properties because different amounts of alcohol are being used in the impregnation stage and in the delignification stage.
    Type: Grant
    Filed: November 1, 1994
    Date of Patent: November 28, 1995
    Inventors: Karl-Heinz Brodersen, Gerhard Dahlmann, Heinrich Leopold