Patents by Inventor Ivan Dalin

Ivan Dalin 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 of bleaching
    Patent number: 5188814
    Abstract: The invention concerns a method of bleaching particles containing calcium carbonate by keeping them in contact with an aqueous solution containing hydrogen peroxide and having a pH-value below 8.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: February 23, 1993
    Assignees: Eka Nobel AB, Faxe Kalk
    Inventors: Pia Hellstrom, Ivan Dalin, Steen Linderstrom-Lang
  • Redox-potential control for hydrogen peroxide in nitric acid
    Patent number: 5154906
    Abstract: A method of maintaining a given content of a substance A in an aqueous solution where it is continuously consumed and where the redox potential E, at least within the range of concentration used, approximately satisfies the equation:E=G+F(x)wherein x is the content of A, F is a function of x whose derivative dF/dx approaches zero when x assumes a high value, and G on the whole is independent of x but is influenced by other parameters, such as pH, temperature or the like. The addition of A is controlled in such manner that a set value of the redox potential is maintained. The set value is determined by increasing or decreasing the addition of A in a predetermined manner, whereupon the redox potential is measured, and the measured value is used for determining the set value.
    Type: Grant
    Filed: January 10, 1991
    Date of Patent: October 13, 1992
    Assignee: Eka Nobel AB
    Inventors: Ivan Dalin, Troy Berglind
  • Method of reducing the emission of NO.sub.x gas from a liquid containing nitric acid
    Patent number: 4938838
    Abstract: A method of reducing, by the addition of hydrogen peroxide, the emission of NO.sub.x gas in the treatment of a nitric acid-containing liquid is disclosed. In the method the redox potential of the liquid is measured and the amount of added hydrogen peroxide is adjusted in relation to the redox potential.
    Type: Grant
    Filed: September 10, 1987
    Date of Patent: July 3, 1990
    Assignee: Eka Nobel AB
    Inventors: Ivan Dalin, Pia Andreasson