Patents by Inventor Adrianus Johannes Den Hartog

Adrianus Johannes Den Hartog 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).

  • Apparatus for purifying flue gas containing nitrogen oxides
    Patent number: 6235248
    Abstract: A device for purifying flue gas containing nitrogen oxides, in which the flue gas is scrubbed with a circulating scrubbing liquid which contains a transition metal chelate such as Fe(II) EDTA and the complex formed from nitrogen oxide and transition metal chelate and/or spent transition metal chelate is regenerated biologically in the presence of an electron donor, nitrogen oxide being reduced to molecular nitrogen. The biological reactor can be combined with the gas scrubber. The electron donor is, for example, hydrogen or methanol, but may also be sulphite which originates from sulphur dioxide in the flue gas.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: May 22, 2001
    Assignee: Biostar Development C.V.
    Inventors: Cees Jan Nico Buisman, Hendrik Dijkman, Petrus Leonardus Verbraak, Adrianus Johannes Den Hartog
  • Process for purifying flue gas containing nitrogen oxides
    Patent number: 5891408
    Abstract: A process and a device for purifying flue gas containing nitrogen oxides, in which the flue gas is scrubbed with a circulating scrubbing liquid which contains a transition metal chelate such as Fe (II) EDTA and the complex formed from nitrogen oxide and transition metal chelate and/or spent transition metal chelate is regenerated biologically in the presence of an electron donor, nitrogen oxide being reduced to molecular nitrogen. The biological reactor can be combined with the gas scrubber. The electron donor is, for example, hydrogen or methanol, but may also be sulphite which originates from sulphur dioxide in the flue gas.
    Type: Grant
    Filed: September 18, 1997
    Date of Patent: April 6, 1999
    Assignee: Biostar Development C.V.
    Inventors: Cees Jan Nico Buisman, Hendrik Dijkman, Petrus Leonardus Verbraak, Adrianus Johannes Den Hartog