Patents by Inventor Mathew Z. Monzingo

Mathew Z. Monzingo 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).

  • Door security device
    Patent number: 5286075
    Abstract: An improved door security device is for a door having a doorknob which consists of an elongated leg brace. A base is located on a lower end of the leg brace for frictional engagement upon a floor. A structure is located on an upper end of the leg brace for engaging the doorknob on the door, so as to prevent an unauthorized opening of the door.
    Type: Grant
    Filed: December 28, 1992
    Date of Patent: February 15, 1994
    Inventor: Mathew Z. Monzingo