Patents by Inventor Edward J. Drost

Edward J. Drost 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).

  • Portable folding table and chairs
    Patent number: 4229038
    Abstract: A portable foldable table having twin table top means and support means which are foldable into a compact configuration wherein an opening is provided which is adapted to receive and retain independent articles, such as chairs, therein and which facilitates convenient transport and storage of the folded unit. A portable foldable chair of similar construction adapted to be received and retained within said opening.
    Type: Grant
    Filed: August 16, 1978
    Date of Patent: October 21, 1980
    Inventor: Edward J. Drost
  • Coal-shale interface detection
    Patent number: 4154084
    Abstract: A penetrometer for coal-shale interface detection for use with coal cutting equipment consisting of a reciprocating hammer having an accelerometer mounted thereon to measure the impact of the hammer as it penetrates the ceiling or floor surface of a mine. Additionally, a pair of reflectometers simultaneously view the same surface, and the outputs from the accelerometer and reflectometers are detected and jointly registered to determine when an interface between coal and shale is being cut through.
    Type: Grant
    Filed: November 3, 1977
    Date of Patent: May 15, 1979
    Assignee: The United States of America as Represented by the Administrator, National Aeronautics and Space Administration
    Inventors: Peter H. Broussard, John L. Burch, Edward J. Drost, Richard J. Stein