Patents by Inventor Lauri A. Lepomaa

Lauri A. Lepomaa 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).

  • Process for producing hydrogen fluoride from an aqueous solution of hydrogen fluoride and sulfuric acid
    Patent number: 4163045
    Abstract: A process for producing hydrogen fluoride from an aqueous solution of hydrogen fluoride and sulfuric acid by distillation at an elevated temperature, in order to evaporate hydrogen fluoride of a desired concentration, in which the aqueous solution of hydrogen fluoride and sulfuric acid is stripped by steam in a separation zone, the released hydrogen fluoride is passed through a drying zone, where it is contacted with a batch of strong sulfuric acid in order to produce hydrogen fluoride of a desired concentration, and the sulfuric acid from the drying zone is fed to the separation zone.
    Type: Grant
    Filed: December 15, 1977
    Date of Patent: July 31, 1979
    Assignee: Kemira OY
    Inventors: Arie Van der Meer, Lauri A. Lepomaa