Patents by Inventor David W. Dobyns

David W. Dobyns 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).

  • Changeable message outdoor advertising sign
    Patent number: 4693026
    Abstract: An internally illuminated sign structure wherein the message is formed by interchangeable panels.
    Type: Grant
    Filed: August 14, 1986
    Date of Patent: September 15, 1987
    Assignee: Allen-Morrison, Inc.
    Inventors: David T. Callahan, David W. Dobyns