Patents by Inventor William T. Johnston

William T. Johnston 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: 4954039
    Abstract: A dump trailer for transporting containers includes a movable frame that receives an associated container. A support plate operatively engages a fifth wheel of a tractor. Interposed between the support plate and the frame is a telescopic hoist assembly to pivot the frame relative to the support plate. A draft arm also extends between the support plate and frame to guide movement of the frame during the hoisting operation. Loading and unloading of the container relative to the tilted frame is controlled by a cylinder and cable assembly secured to the frame. The support plate and frame also include a series of flanges for locking the frame against lateral and longitudinal movement relative to the support plate.
    Type: Grant
    Filed: October 27, 1988
    Date of Patent: September 4, 1990
    Assignee: Trailstar Mfg. Corp.
    Inventors: William T. Johnston, Leslie Smith, Jr., David K. Barker
  • Patent number: 4923074
    Abstract: A box-like sealable container for transporting and discharging material includes an improved tailgate and tailgate seal. The container has walls which define an opening, and the tailgate attached thereto has a periphery that overlies the opening. The tailgate seal is an elongated tubular member mounted inside a metal channel fastened on an outer wall of the container about the opening. When pressurized, the tubular member expands out of the channel and sealingly engages the tailgate if the tailgate is in a closed first position. Reinforcement members mounted on an outer wall of the tailgate prevent tailgate distortion.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: May 8, 1990
    Assignee: Trailstar Manufacturing
    Inventor: William T. Johnston
  • Patent number: 4905458
    Abstract: A saddle girth includes an elongated member having a length sufficient to completely encircle about the midsection of an animal. An inner surface of the elongated member faces the animal during use. Gripping members extend from the inner surface of the elongated member to the animal to increase rotatable friction forces and to decrease the likelihood that the elongated member will rotatably slip when secured into place. First interlocking hook and loop type fasteners are affixed onto portions of the elongated member at locations adapted for adjusting and securing the circumferential extent of the girth about the animal. Second interlocking hook and loop type fasteners are affixed at a saddle receiving portion of the girth. Reinforcement material is included on the elongated member at the portion where the saddle is received.
    Type: Grant
    Filed: November 23, 1988
    Date of Patent: March 6, 1990
    Inventors: William T. Johnston, Harold Timberlake
  • Patent number: 4877184
    Abstract: A heating system for a transportable enclosure comprising a first side wall and a second side wall; the first side wall being an exterior wall and the second side wall being an interior wall; a third side wall connected to and facing the second side wall, a fourth side wall defining an interior space of the enclosure; the second side wall and the third side wall defining a predetermined space therebetween; an inlet passage provided at a first location in communication with said predetermined space therebetween; an inlet passage provided at a first location in communication with said predetermined space; an air passage provided at a second location in communication with said predetermined space; heating means for supplying heat to said inlet passage; conduit means for connecting said heating means and said inlet passage; means for distributing said heat throughout said predetermined space; and, exhaust means for exhausting said heat from said predetermined space.
    Type: Grant
    Filed: June 20, 1988
    Date of Patent: October 31, 1989
    Inventor: William T. Johnston
  • Patent number: 4751873
    Abstract: A heating system for a transportable enclosure comprising a first side wall and a second side wall; the first side wall being an exterior wall and the second side wall being an interior wall; a third side wall connected to and facing the second side wall, a fourth side wall defining an interior space of the enclosure; the second side wall and the third side wall defining a predetermined space therebetween; an inlet passage provided at a first location in communication with said predetermined space; an air passage provided at a second location in communication with said predetermined space; heating means for supplying heat to said inlet passage; conduit means for connecting said heating means and said inlet passage; means for distributing said heat throughout said predetermined space; and, exhaust means for exhausting said heat from said predetermined space.
    Type: Grant
    Filed: November 28, 1986
    Date of Patent: June 21, 1988
    Inventor: William T. Johnston
  • Patent number: 4175906
    Abstract: An automatically actuated hydraulically powered vibrator system for loosening the contents of a semi trailer dump body so that it will break away at its natural dumping angle. The semi trailer dump includes a hydraulic pump which delivers hydraulic fluid under pressure to extend a telescoping hydraulic cylinder to raise the dump body to a dumping position. An adjustable normally closed pressure relief valve is set to open when the pressure in the cylinder reaches a predetermined level corresponding to a dump body angle a few degrees less than the normal dumping angle for the commodity being dumped. When the valve opens, hydraulic fluid is pumped to a hydraulic motor which drives a vibrator which is bolted to the dump body. The vibrator loosens the material being dumped and prepares it to slide out of the body at its natural dumping angle.
    Type: Grant
    Filed: November 10, 1977
    Date of Patent: November 27, 1979
    Inventors: William T. Johnston, N. Glen Barker
  • Patent number: D312599
    Type: Grant
    Filed: August 11, 1988
    Date of Patent: December 4, 1990
    Inventor: William T. Johnston