Patents by Inventor Jan L. Jonsson

Jan L. Jonsson 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 decoloring sulphuric acid deriving from acid production processes
    Patent number: 5026535
    Abstract: The present invention relates to a method for decoloring sulphuric acid produced in accordance with the contact method, comprising one or more absorption circuits. The produced sulphuric acid is decolored by adding hydrogen peroxide to the system. The method is characterized by adding the hydrogen peroxide to the sulphuric acid in the final absorption circuit, and by maintaining the temperature in this circuit above about 70.degree. C.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: June 25, 1991
    Assignee: Boliden Contech AB
    Inventors: Jan L. Jonsson, Sten A. Nilsson