Patents by Inventor Per Widmark

Per Widmark 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 preparing chlorate
    Patent number: 5154805
    Abstract: The invention discloses a method in the electrolytic production of alkali metal chlorate which is recovered by crystallization and separation of the crystals from a solution recycled to the electrolysis process. A given proportion of the crystals formed are separated and removed from the mother liquor after they have been in contact with the mother liquor for a shorter period of time than the remaining crystals, whereby they obtain a sulphate content which is higher than in the crystals that have been in contact with the mother liquor for a longer period of time.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: October 13, 1992
    Assignee: Eka Nobel AB
    Inventors: Ann Wide, Per Widmark