Patents by Inventor Pertti Kokkonen

Pertti Kokkonen 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 producing cement or concrete
    Patent number: 4985081
    Abstract: A method of producing cement or concrete, comprising the step of adding fly ash to the cement or concrete at the production stage, the fly ash containing lime and reaction products from the reaction occurring between lime and sulphur oxides in connection with the desulphuration of flue gases. To avoid the disadvantageous effects of calcium sulphite and entringite reactions and to increase the used amount of fly ash containing desulphuration waste, the calcium sulphite is oxidized by hydrogen peroxide either before the production of cement or concrete or during the production.
    Type: Grant
    Filed: February 28, 1990
    Date of Patent: January 15, 1991
    Assignee: Oy Iampella AB
    Inventors: Heikki Ahonen, Timo Kenakkala, Pertti Kokkonen