Patents by Inventor Michael J. Cardinal

Michael J. Cardinal 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).

  • Anti-jamming device for security screens
    Patent number: 5134943
    Abstract: An anti-jamming device for a security screen arrangement, in which a security screen is able to be rapidly fired from a rest position to an upper position at which passage of a person from one side of the screen to another is not possible, includes sensors for detecting whether the screen is at the rest position or the upper position. The device also includes a valve for lowering a screen when it does not reach the upper position, due to the screen having been jammed, and for reactivating the firing of the screen. The screen may be repeatedly fired until the obstruction is cleared.
    Type: Grant
    Filed: November 14, 1990
    Date of Patent: August 4, 1992
    Assignee: Safetell International Security, Ltd.
    Inventor: Michael J. Cardinal
  • Security screen
    Patent number: 4831939
    Abstract: A security screen having two rams to operate the screen which are located against the panel of the screen, the rams being connected at one of their ends substantially symmetrically relating to the center of the screen at or adjacent the top thereof and, at their other ends, substantially symmetrically relative to the screen to a structure beneath or beside the screen, the connections being such as to permit at least a degree of rotation of the rams relative to the panel and the structure, the arrangement being such that, as the rams are extended, the outward component of forces of the rams are substantially equal and opposite, the resultant being an upward component which can drive the screen upwardly rapidly.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: May 23, 1989
    Assignee: Saftell Pty. Limited
    Inventor: Michael J. Cardinal
  • Security screen
    Patent number: 4748914
    Abstract: A security screen having two rams to operate the screen which are located against the panel of the screen, the rams being connected at one of their ends substantially symmetrically relating to the center of the screen at or adjacent the top thereof and, at their other ends, substantially symmetrically relative to the screen to a structure beneath or beside the screen, the connections being such as to permit at least a degree of rotation of the rams relative to the panel and the structure, the arrangement being such that, as the rams are extended, the outward component of forces of the rams are substantially equal and opposite, the resultant being an upward component which can drive the screen upwardly rapidly.
    Type: Grant
    Filed: July 23, 1985
    Date of Patent: June 7, 1988
    Assignee: Saftell Pty. Limited
    Inventor: Michael J. Cardinal