Patents by Inventor Tuija Andersson

Tuija Andersson 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).

  • Method for sizing paper
    Patent number: 6187144
    Abstract: A method for internal sizing of paper using cationic starch is provided. The starch used is cationized with a mixture of epichlorhydrin, trimethylamine, and mono-or dimethylamine or N,N,N′,N′-tetramethylethylenediamine. Cationizing results in a higher molecular size of the starch, which has e.g. a beneficial effect on dewatering on the paper machine forming wire.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: February 13, 2001
    Assignee: Raisio Chemicals Oy
    Inventors: Hannu Ketola, Tuija Andersson, Asko Karppi, Sauli Laakso, Antti Likitalo