Patents by Inventor Heleen Nieuwenhuis

Heleen Nieuwenhuis 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).

  • Use of tracers to monitor application of treatment products to cut flowers
    Patent number: 6472219
    Abstract: A method to determine whether the desired amount of treatment product is present in water that cut flowers are placed in, is described and claimed. The method comprises formulating the treatment product so that it contains an inert fluorescent tracer, wherein the inert fluorescent tracer is added in a known proportion to the rest of the treatment product, then using a fluorometer to detect the fluorescent signal of the fluorescent tracer. The fluorescent signal of the fluorescent tracer is used to determine the amount of fluorescent tracer present and the amount of fluorescent tracer present is then used to determine the amount of treatment product present in the water that cut flowers are placed in.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: October 29, 2002
    Assignee: Ondeo Nalco Company
    Inventors: Heleen Nieuwenhuis, Jan A. M. Janssen, John E. Hoots