Patents by Inventor Maria Wennerström

Maria Wennerström 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 BLEACHING PULP FROM RECYCLED TEXTILE MATERIAL
    Publication number: 20230392320
    Abstract: The invention relates to a method for bleaching pulp formed from recycled textile material comprising cellulose, said method comprising ozone bleaching (3; 13a, 13b) of said pulp by means of adding ozone at a charge of at least 12 kg/odt, wherein said ozone bleaching (13a, 13b) is performed as two subsequent steps, each comprising adding ozone at a charge such that the overall charge is at least 12 kg/odt.
    Type: Application
    Filed: November 8, 2021
    Publication date: December 7, 2023
    Inventor: Maria WENNERSTRÖM
  • METHOD OF PRODUCING DISSOLVING PULP FROM LIGNOCELLULOSIC MATERIAL
    Publication number: 20170130397
    Abstract: The present invention relates to an improved process for producing dissolving pulp from a hydrolysis-kraft cooking process, and wherein production increases may result in less viscosity reduction and thus not meeting the target viscosities in the dissolving pulp produced. In order to compensate for losses in viscosity reduction in the cook at production increases is the oxygen delignification stage boosted with modest charges of peroxide that introduce an additional viscosity reduction.
    Type: Application
    Filed: June 15, 2015
    Publication date: May 11, 2017
    Applicant: Valmet AB
    Inventors: Håkan Dahllöf, Stefan Antonsson, Maria Wennerström, Lari Lammi, Lars Sjödin