Patents by Inventor Helwig Teubner

Helwig Teubner 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 production of hydroxypropyl starch
    Patent number: 4451649
    Abstract: A process for the production of hydroxypropyl starch wherein the starch is etherified in the presence of a small amount of water with an excess of propylene oxide which hydroxypropyl starch is used as plaster additive.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: May 29, 1984
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Helwig Teubner, Wilhelm Oppermann