Patents by Inventor Ants Teder

Ants Teder 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 of making cellulose pulp with a sulphite cooking liquor containing sulphide and a quinone or hydroquinone compound
    Patent number: 4786365
    Abstract: A process of manufacturing cellulose pulp from wood by digesting the wood with sulphite cooking liquor containing additions of sulphide and in the presence of a quinone or hydroquinone compound. According to the invention, the mole ratio between sulphide and sulphite shall amount to 0.01-0.2, preferably 0.05.0.15, suitably 0.08-0.12.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: November 22, 1988
    Assignee: Svenska Traforskningsinstitutet
    Inventors: Ants Teder, Leelo Olm, Jan-Erik Wilken