Patents by Inventor Seppo Martikainen

Seppo Martikainen 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).

  • Batch process for preparing pulp
    Publication number: 20060175029
    Abstract: According to the invention, polysulfide is used in the manufacture of kraft pulp in the initial stage of a displacement batch process in order to improve the yield. Polysulfide-containing white liquor is added inter-mixed with the first liquor charged to the digester, or as a separate charge before the impregnation liquor is introduced. Preferably, a cooking catalyst, e.g. antraquinone, is added to the white liquor charge as the cooking stage commences.
    Type: Application
    Filed: December 22, 2004
    Publication date: August 10, 2006
    Applicant: Metso Paper Inc.
    Inventors: Seppo Martikainen, Panu Tikka, Olli Timonen, Mikael Svedman
  • Treatment of cellulosic material with a chelating agent prior to alkaline delignification
    Patent number: 6413367
    Abstract: A process for the production of pulp using alkaline delignification is disclosed, wherein cellulosic material is initially treated with steam, and a chelating agent is added in connection with the steam treatment. The end pH of the steam treatment stage is below 5. Liquors containing chelated, so-called non-process compounds are not recycled in the pulping process, but expelled therefrom for further processing where non-process compounds are eliminated.
    Type: Grant
    Filed: August 3, 2001
    Date of Patent: July 2, 2002
    Assignee: Valmet Chemical Pulping OY
    Inventors: Mikael Svedman, Thomas Fant, Seppo Martikainen