Patents by Inventor Charles T. Merrill

Charles T. Merrill 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).

  • Patent number: 5867939
    Abstract: The present invention relates to a gate closing device which operates either in an automatic mode or a manual mode. The device includes a first track which is adapted to be secured to a gate, and a second track to which a driving motor is interconnected. A linkage is slidably interconnected to both of these tracks. Activation of the motor results in the movement of the linkage, and thus the opening or closing of the gate. A damping device is employed at the first end of the linkage. The damping device enables the gate to be opened a slight distance without activating the motor.
    Type: Grant
    Filed: October 2, 1997
    Date of Patent: February 9, 1999
    Inventor: Charles T. Merrill
  • Patent number: 4027990
    Abstract: The embodiment of the invention disclosed herein is directed to a curber and sidewalk-forming apparatus for contouring concrete along a predetermined run. The apparatus includes a hopper having at least one wall thereof sloping downwardly toward an opening formed in the bottom of the hopper which coincides with an opening formed in a slide plate surface at the bottom of the machine. Flowable concrete passes from the hopper through the opening in the slide plate and is directed rearwardly of the apparatus while the apparatus is transported in a predetermined direction along its run. A vibrating apparatus is secured to one of the walls of the hopper to insure proper flow of the concrete along the interior surface of the hopper so that the concrete continuously flows beneath the apparatus for forming curbs, gutters and sidewalks. A motor generator set is secured to the slide plate and produces electricity to operate electrical motors of the vibrator and winch secured thereto.
    Type: Grant
    Filed: October 6, 1975
    Date of Patent: June 7, 1977
    Inventor: Charles T. Merrill