Patents by Inventor Sigrid Anspach

Sigrid Anspach 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 and acid bleaching of cellulose with oxygen and hydrogen peroxide
    Patent number: 4626319
    Abstract: A process for the delignification and bleaching of cellulose with oxygen and hydrogen peroxide, in which in a given case the delignification is carried out with oxygen in the presence of MgO, and the cellulose subsequently is bleached simultaneously with hydrogen peroxide and oxygen at a pH<5.
    Type: Grant
    Filed: July 22, 1985
    Date of Patent: December 2, 1986
    Assignee: Degussa Aktiengesellschaft
    Inventors: Horst Kruger, Hans-Ulrich Suss, Gerhard Arnold, Sigrid Anspach, Ursula Schwartzkopff, Hans Jelitto