Patents by Inventor John C. Hardison

John C. Hardison 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: 4687576
    Abstract: In a sewage treatment system having a series of generally concentric, ring-like treatment tanks, a siphoning head used to withdraw sludge from the bottom of the clarifying tank is propelled slowly and smoothly through its tank by the moving current of sewage in an adjacent tank. Overhead bridge structure supporting the siphoning head in the clarifying tank also overhangs the next adjacent tank and supports a depending baffle which is impinged by the flowing sewage in the adjacent tank. The baffle is positioned closely adjacent the wall between the two tanks such that eddy currents set up in the vicinity of the baffle as the latter is acted upon by the flowing sewage have the effect of entering transfer passages between the two tanks to clean out clogging debris and grease.
    Type: Grant
    Filed: September 16, 1985
    Date of Patent: August 18, 1987
    Inventor: John C. Hardison
  • Patent number: 4614480
    Abstract: The pumping system employs horizontal shaft pumping units, each of which may be vacuum primed by a priming chamber which is mounted on the discharge outlet of the pump volute at a position above the volute itself. Preferably, each of the pump volutes has its discharge passage inclined within the vertical plane of the volute so that friction losses at points of connection to other piping of the system is minimized and space occupied by the system is likewise reduced. The inclination of each discharge passage is such that no portion of the internal pumping chamber of the volutes is higher than the point of intersection between the discharge passage and the chamber, whereby to avoid trapping air within the chambers. Specially configured and arranged ball check valve assemblies downstream from each pump unit are designed to provide a pool of liquid submerging the seat for the valve of each assembly when the system is in an idle or standby condition whereby to promote an effective, air-tight sealing action.
    Type: Grant
    Filed: February 6, 1984
    Date of Patent: September 30, 1986
    Inventor: John C. Hardison
  • Patent number: 4539110
    Abstract: An improved, self-cleaning, bidirectionally shiftable liquid contacting device is provided which serves to give enhanced aeration and mixing of liquids such as sewage water at a relatively low cost in terms of horsepower input. The device preferably includes a rotatable, flat, annular plate provided with oppositely projecting, circumferentially spaced, radially oriented rows of liquid-contacting elements strategically located and configured for maximum effectiveness. Each element is in the form of a flat-topped, solid body presenting a pair of elongated, opposed, inclined, converging, concave faces, with the axes of the respective concavities being transverse relative to one another. As the plate is rotated, the leading concave face gives excellent mixing and lateral liquid diversion, whereas at the trailing concave face, a suction action serves to draw air deeply into the liquid for subsequent release and aeration.
    Type: Grant
    Filed: August 3, 1983
    Date of Patent: September 3, 1985
    Inventor: John C. Hardison