Patents by Inventor Harmannus Johannes Doddema

Harmannus Johannes Doddema 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).

  • Biological filter for removing volatile hydrophobic compounds from gas emissions
    Patent number: 5691192
    Abstract: Biological filter for removing volatile, hydrophobic compounds, such as toxic styrene, from gas emissions. These are broken down with a fungus, which is immobilized on a carrier of inert material, such as perlite. Preferably active carbon is also added. The filter is manufactured by cultivating the fungus on the carrier with the aid of the compound which is to be removed. In order to be able to make a filter quickly with a homogeneous distribution of the fungus therein, it is preferable to use a spore forming fungus.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: November 25, 1997
    Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek - TNO
    Inventors: Hubertus Henricus Jacobus Cox, Harmannus Johannes Doddema
  • Process for removing noxious compounds
    Patent number: 5667690
    Abstract: A process is described for removing noxious compounds such as hydrocarbons which may or may not contain halogen and/or may or may not be aromatic, from solids (soil), water or gas, according to which process the solid, the water or the gas is treated with a complex of a transition metal and an alkaline polyamine in the presence of a peroxide. The complex is, for example, a complex of iron chloride and 1,4,7-trimethyl-1,4,7-triazonane. The peroxide is preferably electrochemically produced hydrogen peroxide.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: September 16, 1997
    Assignee: Nederlandse Organisatie voor Toegepast - Natuurwetenschappelijk
    Inventors: Harmannus Johannes Doddema, Arie Cornelis Besemer, Marinus Pieter Harkes