Abstract: An Unmanned Aerial Vehicle (UAV) air traffic control method utilizing wireless networks and concurrently supporting delivery application authorization and management communicating with a plurality of UAVs via a plurality of cell towers associated with the wireless networks, wherein the plurality of UAVs each include hardware and antennas adapted to communicate to the plurality of cell towers; maintaining data associated with flight of each of the plurality of UAVs based on the communicating; processing the maintained data to perform a plurality of functions associated with air traffic control of the plurality of UAVs; and processing the maintained data to perform a plurality of functions for the delivery application authorization and management for each of the plurality of UAVs.

Abstract: A pump control system which can distinguish between water and oil so that a pump can be controlled to pump water and deactivated before oil is pumped. Sensing is accomplished by a pair of capacitive sensors, one located above the other in a vessel in which water accumulates. A dual mode frequency oscillator is associated with each sensor. Each sensor reacts to the dielectric constant of the liquid at the sensor by changing its capacitance, to thus detect the presence of a conductive substance, such as a liquid, to cause the sensor's oscillator to switch its mode of oscillation. The dual mode oscillator of each sensor selectively generates a control signal having two different duty cycles. As the dielectric constant of the liquid medium is sensed, a logic circuit interposed between the sensors allows the output of each sensor to be turned off when only the lower sensor is in water. The circuit turns on the pump only when both sensors are in water and the pump remains on until both sensors are out of water.

Abstract: A tire inflation device for delivering a fluid, such as carbon dioxide, from a liquid gas cartridge to a pneumatic tire wherein the device has a capability of controlling inflation to enable the user to achieve a preset desired tire pressure. A cartridge activating mechanism is provided. A cartridge securing mechanism is provided which prevents removal of an activated, unspent cartridge from the inflating device.

Abstract: A proximity detection system includes a dual mode oscillator for generating a pair of ON and OFF control signals. A sensing circuit including a capacitance device detects the presence of a conductive object, such as a liquid, to cause the oscillator to switch its modes of oscillation.

Abstract: A proximity detection system includes a dual mode oscillator for generating a pair of ON and OFF control signals. A sensing circuit including a capacitance device detects the presence of a conductive object, such as a liquid, to cause the oscillator to switch its modes of oscillation.