Patents by Inventor Sheldon Schilstra

Sheldon Schilstra 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).

  • Tube blockage sensing systems
    Publication number: 20020128783
    Abstract: Systems for detecting blockages in tubes are proposed based either by photoelectric sensing with illumination at one end or by an airflow and sensing with a flap valve and proximity or angle sensor at the other end.
    Type: Application
    Filed: June 11, 2001
    Publication date: September 12, 2002
    Inventors: Mike Marcu, Sheldon Schilstra