Patents by Inventor Risto Rahkola

Risto Rahkola 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 CHLORINE DIOXIDE
    Publication number: 20150021276
    Abstract: The present invention provides a method for producing chlorine dioxide by reducing sodium chlorate with a reducing agent in the presence of a strong acid comprising feeding ammonium salt to the reactor to produce also chloramine. The present invention also provides a method for disinfecting water.
    Type: Application
    Filed: January 23, 2013
    Publication date: January 22, 2015
    Inventors: Risto Rahkola, Ville Stalhandske
  • BLEACHING METHOD
    Publication number: 20110203485
    Abstract: Methods for treating lignocellulosic material or pigment with a reductive bleaching solution generally include washing the lignocellulosic material or pigment with a reducing agent of magnesium dithionite. The method includes at least one reductive stage and at least one peroxide stage. Also disclosed are methods for preparing dithionite solution wherein magnesium bisulfite is reduced with borohydride solution to obtain dithionite. Bleached lignocellulosic material or pigment obtained with the treatment methods are also disclosed.
    Type: Application
    Filed: October 30, 2009
    Publication date: August 25, 2011
    Applicant: KEMIRA OYJ
    Inventors: Risto Rahkola, Birgitta Peltopakka, Hannu Hämäläinen, Jonas Konn, Sari Vahlroos-Pirneskoski
  • Method for preparing dithionite
    Patent number: 7993622
    Abstract: The present invention relates to a method for preparing dithionite solution with a reaction wherein sodium bisulfite is reduced with sodium borohydride solution to obtain dithionite, wherein the rise of the pH of the solution is prevented by adjusting the pH with carbon dioxide.
    Type: Grant
    Filed: April 25, 2008
    Date of Patent: August 9, 2011
    Assignee: Kemira OYJ
    Inventor: Risto Rahkola
  • METHOD FOR PREPARING DITHIONITE
    Publication number: 20100181531
    Abstract: The present invention relates to a method for preparing dithionite solution with a reaction wherein sodium bisulfite is reduced with sodium borohydride solution to obtain dithionite, wherein the rise of the pH of the solution is prevented by adjusting the pH with carbon dioxide.
    Type: Application
    Filed: April 25, 2008
    Publication date: July 22, 2010
    Inventor: Risto Rahkola