Abstract: An infra-red secure remote controller having a xenon gas discharge tube which is ignited and pulse modulated with a code impressed on the resultant xenon plasma arc. Each pulse modulated code represents a channel formed of a short pulse burst train of a plurality of high-energy optical pulses. The optical pulses are repeated about 10 to 15 times in a pulse burst train, so that the actual pulse burst train duration will comprise the pulses plus the dark interval time between pulses. Both the pulse length, the dark interval time, and the pulse burst train length are used by circuitry in a receiver for the controller to identify and distinguish an actual transmission from other interfering transmissions. The infra-red remote controller utilizes pulse burst length factors to enhance the reliability of the transmission and increase the possible number of separate codes available.

Abstract: A miniature air purifier produces a corona discharge surrounding a needle-like emitter point connected to a novel negative 8,000-volt DC power supply. The power supply operates from a nine volt battery and contains a step-up voltage inverter having a single transformer outputting high voltage spikes with a voltage multiplier operating on the output of the inverter. The production of high voltage spikes of about 200 Hz rather than a sinusoidally varying voltage significantly reduces current consumption. The needle-like emitter point is located about 1/4-inch from an 80% open mesh metallic grid held at ground potential. Corona discharge at the emitter point ionizes the air and creates ozone, and nitric oxide both of which combine with direct electron impact decomposition to detoxify and destroy a wide variety of airborne pollutants including pathogens, chemicals and allergens.

Abstract: A high intensity ultrasonic sound generator for producing bursts of ultrasonic frequency and a method of controlling vermin and pests by projecting such bursts into a space from which such vermin and pests are desired to be eradicated. The apparatus has a transformerless power supply employing a voltage divider with a low leakage input capacitor and an output capacitor having a significantly larger capacitance than that of the input capacitor, and wherein the load is voltage dependent so that the greater the charge on the output capacitor, the greater the load and, therefore, the output capacitor is prevented from excessively charging. Ultrasound frequency is generated by two astable multivibrators one of which duty cycles the other and means are provided to vary the frequency within each burst and the burst interval.

Abstract: A remote controlling apparatus comprising a transmitter including a pulse generating circuit the output of which is a plurality of pulses of radiant energy having an envelope of a selected pulse width and a selected pulse interval and a receiver including an envelope detection circuit, the output of which is a plurality of pulses each having the selected pulse width and having the selected pulse interval of the transmitted radiant energy, concidence pulse generating means for generating coincidence pulses responsive to transitions in the output pulses from the envelope detection circuit, with one such coincidence pulse being generated at a selected time after a transition in each such output pulse and one being generated in coincidence with a transition in each such output pulse, the selected time being selected such that coincidence of the generated coincidence pulses will only occur when the output of the envelope detection circuit has a selected pulse width, and coincidence detection coupled to a triggerin

Abstract: A radio frequency oscillator circuit has its tuning circuit coil mounted so as to conveniently receive an object to be tested in preselected precisely defined positions proximate to the windings thereof. A "standard" metal object is placed in a predetermined position proximate to the coil windings and the oscillator activated. The output of the oscillator is detected to produce a DC which is a function of the size, shape, specific gravity and metallic content of the piece being tested. This DC output is amplified and fed to a meter. A nulling circuit is utilized to "null" the meter circuit with the "standard" or reference object in position proximate to the oscillator coil. An object to be tested is then placed proximate to the coil in precisely the same position that was formerly occupied by the "standard" and the meter observed for deviations from the "null" position.