Patents by Inventor Dirk Schmal

Dirk Schmal 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 in-situ cleaning by means of microorganisms of a polluted soil portion
    Patent number: 5919351
    Abstract: A method is described for the in-situ cleaning by means of microorganisms of a polluted soil portion which contains ground water. In this method, the soil portion to be cleaned is enclosed, and one or several electrodes which are permeable to liquid are placed in or adjacent the soil portion. A negative or positive voltage is applied to these electrodes. The enclosure of the polluted soil portion takes place in such a manner that the ground water present in the soil portion flows mainly through the one or several electrodes.
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: July 6, 1999
    Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
    Inventors: Hubertus Henricus Martinus Rijnaarts, Dirk Schmal