A high power switching circuit is disclosed which utilizes a four-terminal Darlington transistor block to improve switching speed, particularly in rapid turn-off. Two independent reverse drive currents are utilized during turn-off in order to expel the minority carriers of the Darlington pair at their own charge sweep-out rate. The reverse drive current may be provided by a current transformer, the secondary of which is tapped to the base terminal of the power stage of the Darlington block. In one application, the switching circuit is used in each power switching element in a chopper-inverter drive of an electric vehicle propulsion system.

Patent for combination-heater in which it can be submerged directly in a body of water contained in any open-top vessel, such as a bath-hub, bucket or other receptacle for the purpose of raising the temperature of the water to a desired degree. (Lines 12-16) Illustration is included.

An inductive method and apparatus for forming detached spheromak plasma using a thin-walled metal toroidal ring are described that uses external current leads and internal poloidal and toroidal field coils located inside a vacuum chamber filled with low density hydrogen gas and an external axial field generating coil. The presence of a current in the poloidal field coils, and an externally generated axial field sets up the initial poloidal field configuration in which the field is strongest toward the major axis of the toroid. The internal toroidal-field-generating coil is then pulsed on, ionizing the gas and inducing poloidal current and toroidal magnetic field into the plasma region in the sleeve exterior to and adjacent to the ring and causing the plasma to expand away from the ring and toward the major axis. Next the current in the poloidal field coils in the ring is reversed. This induces toroidal current into the plasma and causes the poloidal magnetic field lines to reconnect. The reconnection continues until substantially all of the plasma is formed in a separated spheromak configuration held in equilibrium by the initial external field.

Patent for "a system of switching where the cars of a train are pushed up an incline and placed successively on an elevated annular revolving platform, by which they are automatically distributed to their respective receiving-tracks" (lines 9-14).

Patent for a brush used with pressurized water to clean floors, walls, ceilings, horses, buggies, animal carcasses, etc. The brush can have a hose hooked up to it and has a valve. The water goes into the top of the brush and is distributed evenly throughout with holes in the top of the brush, and the water is sprayed through the bristles.

Patent for a new and improved combined chimney and ventilator. This design consists "[i]n a combined ventilator and smoke-flue, a series of pipes or flues having a sectional inclosing casing extending from the ceiling of a room and adapted to receive a stove-pipe, the lower drum or casing being provided with a series of openings, and having an annular flange, the top casing being located without the building, having its lower end within the space between the roof and ceiling, and braces, said upper casing having a downwardly-extending flange at its lower end" (lines 18-28).

Patent for a new and improved churn. This design "relates to improvements in rotary churns; and it consists in the combination of the dasher-staff made screw-threaded at its upper end, and having a dasher secured to its lower one; a pinion which is applied to the screw-threaded part of the shaft, and which has a rising and falling movement thereon; the driving-wheel which operates the two pinions, and through them the two dashers, and the sleeve, which is connected to the lower pinion and one of the dashers" (lines 13-23).

Patent for improvements in coops for fowls and other birds by using a combination of a cage with a door having a depending leg, a post and a lever for raising and lowering the cage; the cage door is “automatically opened when lowered and closed as it is raised,” (lines 75-76) "so that the young will be out of danger from attacks of rodents, collecting water, &c...," (lines 22-23) includes illustration.

Patent for improvements in car-couplings by providing "a coupler which will without any adjustment couple two cars whose draw-heads are of different heights.” (lines 17-19) Illustration is included.

Patent for a gate lock that automatically locks.

Patent for a fruit drier that includes "a series of hinged trays adapted to be folded into small compact form." (lines 11-13) including instructions and illustrations.

Patent for an attachment that can be connected to a sewing machine to facilitate quilting.

Patent for a device that stretches wire, specifically for fence construction.

Patent for an insecticide to kill red ants and "other noxious insects" (line 9).

Patent for a water or oil well screen to keep mud and other debris out of the barrel of the well.

Patent for a weight motor. This invention is meant for the use of driving fans to circulate rooms. This "invention refers to the winding mechanism wherein a drum on which the cord is wound and the first gear wheel are independently rotatable in one direction on the winding shaft, the latter having keyed thereon two ratchet wheels which engage respectively, pawls on the drum and on the gear wheel" (line 13-20). Illustration included.

Patent for a magazine rifle. This invention consists of a combined breech block and cartridge carrier. Illustrations included.

Patent for an insect destroyer consisting of a steam-generator used with "removable drawers forming the fire-box and ash-pan of the generator, a safety-valve connected with the steam-boiler, and a novel form and construction of flexible discharge-tube, the same being provided with a cut-off device and with a socket-piece adapted to receive a handle by means of which the discharge end of the flexible tube may be elevated and conducted to any desired point" (lines 12-21).

Patent for a lifting jack for car trucks.

Patent for a seat for linemen when stringing telegraph or telephone poles, which has clamps that go around the pole.

Patent for an insertible saw tooth, which does not require the use of a separate holder.

Patent for an insecticide for boll weevils, which is made of oil of sassafras, chalk, water, and sulfate of magnesia.

Patent for a new and improved ventilating chimney. This design consists in "the combination, with the smoke-flue, of the ventilating-flue, the thimble provided with outwardly-projecting lugs and inwardly-projecting apertured lugs, the plate provided with a central aperture and with a flange having notches, and the screws passed through the plate into the apertured lugs" (lines 16-23).

Patent for a tram car. Illustration included.