Patents by Inventor Volker Hartwig

Volker Hartwig 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).

  • Purification of cellulose and starch ethers with counter current washing
    Patent number: 4404370
    Abstract: A process for the purification and isolation of cellulose or starch ethers wherein directly after the etherification step the suspension agent and the extraction of the ether product with the purifying agent is carried out on the same continuously working filter.
    Type: Grant
    Filed: November 23, 1980
    Date of Patent: September 13, 1983
    Assignee: Wolff Walsrode AG and Bayer AG
    Inventors: Claus-Rudiger Bernert, Volker Hartwig, Christian Kords, Detmar Redeker