Patents by Inventor Riitta-Maija Housh

Riitta-Maija Housh 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 producing fire-retarded cellulosic fibers and fire-retarded cellulosic fibers
    Patent number: 4381370
    Abstract: A method for producing fire-retarded blend fibers having a fire resistance LOl-value of at least 21% O.sub.2, made from cellulose and chlorine containing polymer. Chlorine containing polymer having a chlorine content of 30-75% by weight, is blended, either as such or dissolved in a solvent, with a DMSO/formaldehyde solution of cellulose so that the obtained blend has 10-70% by weight of chlorine containing polymers, based on the total amount of cellulose and said polymers. Fibers are produced of the obtained mixture by bringing it into contact with an aqueous or alcoholic solution.
    Type: Grant
    Filed: March 20, 1981
    Date of Patent: April 26, 1983
    Assignee: The Technical Research Centre of Finland
    Inventors: Olli Aaltonen, Martti Alkio, Eero Avela, Riitta-Maija Housh