Patents by Inventor Timo Kalevi Lehto

Timo Kalevi Lehto 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).

  • Removing nitrates with an organic amine salt and ion exchange
    Patent number: 3983222
    Abstract: A continuous process for removing nitrates from nitrate containing aqueous solutions having a pH of about 0-7, which comprises: (1) extracting the nitrate containing aqueous solution with an organic amine salt dissolved in an organic solvent phase whereby the nitrate ion goes into the organic solvent, (2) separating the organic phase, (3) stripping the organic extraction solvent phase from the extraction with a stripping salt solution of pH at least 0.
    Type: Grant
    Filed: November 18, 1974
    Date of Patent: September 28, 1976
    Assignee: Kemira Oy
    Inventor: Timo Kalevi Lehto