Patents by Inventor Charles E. Doyle

Charles E. Doyle 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).

  • Controllable water-displacement device
    Patent number: 5148555
    Abstract: A selectively controlled displacement container is insertible in a standard toilet flush tank. The bottom of a container has a discharge-fill opening, and the top has an air inlet controlled by a selectively activated air inlet valve. Opening this valve adds the contents of the container to that of the surrounding tank. The valve can be restored to closed position by buoyancy forces on the following tank fill.
    Type: Grant
    Filed: February 25, 1991
    Date of Patent: September 22, 1992
    Assignee: Water Logic, Inc.
    Inventor: Charles E. Doyle