Patents by Inventor Karin Ulla Elisabet Helmer

Karin Ulla Elisabet Helmer 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).

  • Composition for sizing cellulose fibers
    Patent number: 3966484
    Abstract: The present invention relates to a composition for the sizing of materials containing cellulosic fibers (e.g. paper) by the use of carbamoyl chlorides.
    Type: Grant
    Filed: March 24, 1975
    Date of Patent: June 29, 1976
    Assignee: Kemanord Aktiebolag
    Inventors: Karin Ulla Elisabet Helmer, Alf Ragnar Reuterhall
  • Process for sizing cellulose fibres
    Patent number: 3940519
    Abstract: The present invention relates to a process for sizing cellulose fibers or cellulose fiber-containing materials by using modified starch containing hydrophobic groups having the general formula ##EQU1## wherein R.sub.1 is an organic, hydrophobic hydrocarbon group having 8-40 carbon atoms and R.sub.2 is a C.sub.1 -C.sub.8 alkyl group or has the same meaning as R.sub.1.
    Type: Grant
    Filed: May 15, 1974
    Date of Patent: February 24, 1976
    Assignee: Kemanord AB
    Inventors: Karin Ulla Elisabet Helmer, Berit Ingegard Simonsson
  • Process for sizing cellulose fibre containing material
    Patent number: 3930932
    Abstract: The present invention relates to a process for sizing cellulose fibers or cellulose fiber containing materials and a composition for carrying out the process. According to the process the time for developing full sizing effect of ketene dimers and carbamoyl chlorides is reduced by carrying out sizing in the presence of a chloroformate or an isocyanate. The composition for carrying out the process comprises of a paper sizing composition containing the sizing agents mentioned above in combination with a chloroformate or an isocyanate.
    Type: Grant
    Filed: January 31, 1974
    Date of Patent: January 6, 1976
    Assignee: Kemanord AB
    Inventors: James Axel Christer Bjorklund, Karin Ulla Elisabet Helmer