Patents by Inventor Donald F. Humphrey

Donald F. Humphrey 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).

  • Roadway barrier
    Patent number: 4138095
    Abstract: A portable, temporary roadway barrier for placement alongside a highway to visually direct and, when necessary, to physically control, automotive traffic.
    Type: Grant
    Filed: July 27, 1977
    Date of Patent: February 6, 1979
    Inventor: Donald F. Humphrey