Patents by Inventor Rudolf Lelgemann

Rudolf Lelgemann 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 producing particulate, water-soluble cellulose derivatives
    Patent number: 6509461
    Abstract: The present invention relates to a new, particularly economical process for producing particulate water-soluble cellulose derivatives. The process involves forming a feed composition of swollen and/or dissolved cellulose derivative, and water. The feed composition is contacted with a carrier and heat exchange gas, in a sieve-free high rotational speed gas jet impact mill, and the cellulose derivative of the feed composition is converted into a solid state form of finely particulate particles. The particulate cellulose derivative is then separated from the heat exchange gas and carrier gas, and optionally dried. The mill drying and the particulate cellulose derivative product are influenced by establishing a specific water content in the swollen and/or dissolved cellulose derivative.
    Type: Grant
    Filed: February 16, 2001
    Date of Patent: January 21, 2003
    Assignee: Wolff Walsrode AG
    Inventors: Hartwig Schlesiger, Martin Morning, Gunter Weber, René Kiesewetter, Rudolf Lelgemann
  • Process for producing particulate, water-soluble cellulose derivatives
    Publication number: 20010034441
    Abstract: The present invention relates to a new, particularly economical process for producing particulate water-soluble cellulose derivatives. The process involves forming a feed composition of swollen and/or dissolved cellulose derivative, and water. The feed composition is contacted with a carrier and heat exchange gas, in a sieve-free high rotational speed gas jet impact mill, and the cellulose derivative of the feed composition is converted into a solid state form of finely particulate particles. The particulate cellulose derivative is then separated from the heat exchange gas and carrier gas, and optionally dried. The mill drying and the particulate cellulose derivative product are influenced by establishing a specific water content in the swollen and/or dissolved cellulose derivative.
    Type: Application
    Filed: February 16, 2001
    Publication date: October 25, 2001
    Inventors: Hartwig Schlesiger, Martin Morning, Gunter Weber, Rene Kiesewetter, Rudolf Lelgemann