Patents by Inventor Hans-Joachim Jordan

Hans-Joachim Jordan 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 and apparatus for taking samples from a groundwater monitoring site
    Patent number: 5224389
    Abstract: A method for taking samples from a groundwater monitoring site realized by measuring an electric conductivity of contaminated groundwater during operating a pump at high r.p.m. and by controlling a predetermined minimum variation of the electric conductivity over a predetermined period of time with subsequent operating of the pump at low r.p.m.
    Type: Grant
    Filed: December 5, 1990
    Date of Patent: July 6, 1993
    Assignees: Grundfos International A/S, Preussag Aktiengesellschaft
    Inventors: Niels D. Jensen, Jorgen Christensen, Konrad Gries, Hans-Joachim Jordan