Patents by Inventor Milton D. Duckworth, Jr.

Milton D. Duckworth, Jr. 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).

  • Aircraft lavatory drain plug
    Patent number: 3954123
    Abstract: A plug for an aircraft lavatory drain port having a radially expandable portion and a resilient sealing member covering the expandable portion. A locking portion is connected for securing the plug in sealing position.
    Type: Grant
    Filed: December 9, 1974
    Date of Patent: May 4, 1976
    Inventor: Milton D. Duckworth, Jr.