Patents by Inventor Ralph D. Jones

Ralph D. Jones 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).

  • Secure type folding door
    Patent number: 4922987
    Abstract: An accordion type folding door assembly designed for mounting across the entrance to a space to be secured. The panels of the assembly are interconnected by supplemental hinges completely shielding the spaces from vandalism and forcible entry, while simultaneously rigidifying and stiffening the door structure.
    Type: Grant
    Filed: January 9, 1989
    Date of Patent: May 8, 1990
    Assignee: Woodfold-Marco Mfg., Inc.
    Inventors: John D. Marontate, Ralph D. Jones, Mark F. Lewis