Patents by Inventor Jonas Grigas

Jonas Grigas 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).

  • Real time asphalt pavement quality sensor using a differential approach
    Patent number: 5952561
    Abstract: A real time differential asphalt pavement quality sensor of the present invention is adapted to measure asphalt density in real time using a differential approach. Two sensors, one in the front of a roller and another behind the roller, measure reflected signals from the asphalt. The difference between the reflected signals provides an indication of the optimal compaction and density of the asphalt pavement. The invention looks at the change in variance over successive passes to determine when the optimal level of compaction has been reached.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: September 14, 1999
    Assignee: Iowa State University Research Foundation, Inc.
    Inventors: Edward J. Jaselskis, Hsiu Han, Jonas Grigas