Patents by Inventor Wessel Luitje Holtman

Wessel Luitje Holtman 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).

  • Multifold Oxygen Measurement Device
    Publication number: 20090126268
    Abstract: The invention relates to a plant cultivating environment comprising: an oxygen sensing arrangement for sensing an oxygen level in said environment. According to the invention, said oxygen sensing arrangement comprises a base plate for underlying a substrate; and a plurality of oxygen sensors each positioned on said base plate at a predetermined position for sensing a local oxygen level in said substrate. In this way, a water irrigation strategy can be based on sensed levels at a plurality of positions.
    Type: Application
    Filed: March 8, 2006
    Publication date: May 21, 2009
    Applicant: Nederlandse Organisatie voor toegepast- natuurwetenschappelijk Onderzoek TNO
    Inventors: Albert Van Duijn, Wessel Luitje Holtman, Arie Draaijer