Patents by Inventor Siegfried Emde

Siegfried Emde 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 and means for the purification of cellulose ethers
    Patent number: 4968789
    Abstract: Process and means for purifying cellulose ethers without flocculation points or with relatively high flocculation points (up to 95.degree. C.) and thermoplastic, i.e. highly propoxylated, products made from cellulose in any form, the crude product is first suspended and the suspension liquid subsequently separated in a reverse filter centrifuge a single-stage or multistage wash can be carried out. The filter cake is discharged by reversal of the filter cloth of the centrifuge.
    Type: Grant
    Filed: August 31, 1988
    Date of Patent: November 6, 1990
    Assignee: Henkel Corporation
    Inventors: Willi Wuest, Wilfried Raehse, Guenther Just, Dieter Kuehling, Siegfried Emde, Erhard Kuehn