Patents by Inventor Brita Swan

Brita Swan 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).

  • Bleaching cellulose pulp with oxygen in the presence of formaldehyde
    Patent number: 4004967
    Abstract: When bleaching wood pulp with oxygen the result can be improved if formaldehyde, methanol, ethanol, isopropanol, glycerol, sorbitol, formic acid, or acetone is added to the pulp.
    Type: Grant
    Filed: July 2, 1975
    Date of Patent: January 25, 1977
    Assignee: Billeruds Aktiebolag
    Inventors: Brita Swan, Rune Gustavsson