Abstract: An RF tag has an enable/disable circuit connected to a critical part of an electronic object/circuit, e.g. a computer mother board. The critical part of the circuit is any circuit component and/or connection that can enable and/or disable the electric circuit operation. Signals are sent to the tag to change data in the tag memory which causes the enable/disable tag circuit to control the critical part to enable and disable the electric circuit. A system checks the status of the tag, e.g. the electronic circuit was paid for, before enabling the electronic circuit.

Abstract: A pulsed combustion acoustic wave generator includes a tubular barrel having an inlet end and an open outlet end, a fuel controller for metering a controlled quantity of fuel into the inlet end of the barrel, an oxidant controller for metering a controlled quantity of oxidant into the inlet end of the barrel and an igniter extending into the inlet end of the barrel that is controllable by an operator to ignite a mixture of fuel and oxidant in the inlet end.

Abstract: A two-phase shock wave generator including a combustion chamber including a first, combustion, portion having an input port and a second, detonation, portion downstream of the first portion and having an output aperture; an air-fuel supply line, operative to feed the input port with an air-fuel mixture, an igniter, associated with the air-fuel supply line, which ignites the air-fuel mixture in the supply line and initiates a burning front which propagates towards the input port and a turbulence stimulator, fixedly mounted in the combustion chamber, which enhances and controls burning of the air-fuel mixture and includes a first section, situated within the combustion portion of the combustion chamber and having a preselected first gas dynamic resistance and a second section, situated within the detonation portion of the combustion chamber and having a preselected second gas dynamic resistance, lower than the first resistance, wherein the first resistance is such that burning of the air-fuel mixture in the com

Abstract: An ultrasonic transmitter and methods for making the same. A plurality of blocks are provided and are formed such that, when they are coupled together, they form at least one ultrasonic whistle in fluid communication with a manifold and an acoustic horn.

Abstract: A noise generator is created by having a high pressure gas applied to a Mach 2 nozzle which is combined in an adjustable nozzle assembly with a resonance tube of adjustable length with a closed end forming a Mach disk between them. The resultant compression and expansion shock wave oscillations exit the resonance tube and are propagated between reflecting domes which direct the generated noise around a test article in a housing which contains the generated noise. A muffler includes a water spray chamber and baffled bulkheads to dissipate the generated noise.

Abstract: Disclosed is an acoustical energy generator having a venturi front section o which is attached a pair of rear tail pipes. A pair of return flow manifolds are respectively connected between said rear tail pipes and said front venturi section at such locations that the static pressure in the former are greater than the static pressure in either of the latter when a fluid is flowing therethrough. Controllable valves are optionally disposed in said return flow manifolds to regulate the fluid flow therethrough, and a freely rotatable flutter valve may be disposed at the common junction of said venturi section and tail pipes to facilitate the rapid transfer and/or cutoff of flow from the former to both of the latter in an alternating manner, and thereby effect a more positive generation of cavitation at a desired frequency of operation. A bridle is connected to the front end of the venturi section and a tractor vehicle is attached thereto by means of a tow cable.

Abstract: An aftermarket signaling system for use in an automobile including one, or more, manually powered ultrasonic sending units and an ultrasonic receiver which may be adhesively mounted in the automobile. The receiver includes a solar panel for recharging its own power supply and a set of lighted displays which are enabled by the ultrasonic signals from the sending units. The receiver may be mounted at the rear window of the vehicle and will thus provide visual signals to the following traffic.

Abstract: An assembly for providing support to a component, such as an ultrasonic component, including converters, boosters and horns which are subjected to continuous and repeated impacts and stresses. Such devices generally have integral nodal flanges for support purposes. In this assembly, shock-absorbing means are placed on each side of the nodal flange. A grip ring assembly is then bolted or otherwise removably fastened, together over the shock-absorbing means and nodal flange, compressing the shock-absorbing means. The component is prevented from rotating with respect to the grip ring assembly by pegs which are driven through holes provided in the grip ring assembly and into slots formed lengthwise in the nodal flange. Hence the flange itself, via the shock-absorbing means, absorbs all of the lengthwise force applied to the component by the grip ring assembly, and the pegs are required to absorb none of it.

Abstract: An underwater sound generator comprising dual opposed pistons in a housing. Dynamic seal assemblies of flexible waterproof material are compressed against the peripheries of the pistons and the housing and form a watertight seal that allows axial motion. Controllers regulate the delivery of pressurized hydraulic fluid to hydraulic actuators which drive the axial motion of the pistons according to a predetermined variation.

Abstract: The horn comprises a body portion, a detachable and hence replaceable end portion, and a securing member securing the end portion to the body portion. The securing member has a first threaded portion received in a tapped hole in the body portion and a second threaded portion received in a tapped hole in the end portion. By rotation of the first threaded portion in its tapped hole, the orientation of the end portion, when it is in tight contact with the body portion, can be corrected. A method of detachably securing an end portion to a body portion of a horn is also claimed.

Abstract: A transmission cable for use with an ultrasonic device such as an ultrasonic machining device is provided. The transmission cable of the present invention comprises a plurality of fine metallic wires coupled between the output terminal of an ultrasonic oscillation generating source and the input terminal of a terminal machining tool of the ultrasonic device. The metallic wires are covered with a flexible tubular member which may preferably be filled with a liquid so that the lateral vibrations of the wires are suppressed thereby. This type of cable is particularly advantageous in that the ultrasonic oscillations of the wires forming the cable can be transmitted efficiently to the terminal machining tool and the cable is suitable and convenient for carrying out the ultrasonic machining operations with the machining tool.

Abstract: A control device includes a housing having a serpentinely disposed channel and a cover, secured to the housing, which converts the channel into an ultrasonic waveguide. One end of the waveguide is bounded by a stationary reflector and the other end of the waveguide communicates with a bore which holds a piezoelectric device matched to the waveguide so as to provide therein, when actuated, a propagating transverse wave in the ultrasonic frequency range. The cover includes three elongated slots, each of which slidably supports a different reflector unit. Each unit has a reflector extending into the waveguide and can be positioned anywhere along its corresponding slot. Actuation of the piezoelectric transducer by an electrical pulse causes an ultrasonic pulse to propagate down the waveguide and parts thereof are reflected back to the transducer where an electrical group of pulse signals are caused to appear.

Abstract: In a first embodiment, a control device includes a housing having a serpentinely disposed channel and a cover, secured to the housing, which converts the channel into an ultrasonic waveguide. One end of the waveguide is bounded by a stationary reflector and the other end of the waveguide holds a piezoelectric transducer matched to the waveguide so as to provide therein, when actuated, a propagating transverse wave in the ultrasonic frequency range. The cover includes a plurality of slots communicating with the waveguide, each slot being located at a different position along the propagation path of the waveguide; and a plurality of resiliently mounted reflectors, each reflector being associated with a different one of the slots and being insertable into the waveguide by, for example, fingertip pressure. Actuation of the transducer by an electrical pulse causes an ultrasonic pulse to propagate down the waveguide.

Abstract: An improved device for generating an ultrasonic signal for use in an area protected by an alarm actuated by an ultrasonic signal. The device includes a tuned, acoustic rod within a cylinder typically about the size of a pen adapted to be worn in a shirt pocket. The device has a spring-actuated hammer which is movable, when triggered, into engagement with the rod to generate an acoustic signal. When the hammer is cocked, it is held in a cocked position by two spaced triggers which must be actuated simultaneously to release the hammer to cause it to move toward and to strike the rod. The cylinder has an opening for indicating the fact that the hammer has been triggered. The device is made so that it cannot be re-cocked without special equipment not available to the public.

Abstract: A pulsator for a jet resonator finding particular value and utility in rodent control while maintaining and achieving improved effectiveness together with built-in safe guards against accidental detrimental or fatal effects of ultrasonic sound on human beings while maintaining a low cost of parts and production thereby making improved pest control available to the broad populous, the pulsator including an elongated upright tube having a jet in a lower-end opening and having a ball-receiving seat structure circumscribing and as a part of the upper outlet opening, with a metal ball of smaller size than the cross-section of the elongated space defined in the tube such that the ball is tossed reciprocatingly upwardly in the tube without unduly limiting fluid stream when the ball is tossed upwardly but retarding the flow of the stream as the ball falls downwardly toward the open nozzle end of the lower-end jet which nozzle preferably projects upwardly into the space for a minor distance, pressure of the stream of

Abstract: The present invention is directed to an ultrasonic sound source made up of diaphragms composed of rectangular plates adapted, in dimensions, to vibrate in a stripes mode, and mounted, in spaced relation and in multiple stages, on a longitudinal resonance rod which is connected to the horn of the vibrator to produce the ultrasonic waves above the audio-frequency. Thus, an intense ultrasonic sound source which is free from noises and is superior in radiation efficiency is provided.

Abstract: A portable underwater signalling apparatus for use by divers having self-contained underwater breathing apparatus (scuba) to signal to other divers as well as surface and underwater vessels. The apparatus utilizes compressed air from the diver's tanks to drive a hammer against a diaphragm to cause sound waves to be transmitted through the water.

Abstract: Apparatus is described for welding of thermoplastic parts and the like where the heat to melt the surface or surfaces to be joined is produced by friction during high frequency rubbing. The parts are adapted to be placed on a platen which enables the mating surfaces of the parts to be brought into clamping engagement in a welding head. The welding head includes a seismic mass. Stiff flexural members support a plate, against which the parts are clamped with respect to the seismic mass, and which provides for relative vibratory motion of the mating surfaces to be joined. A hydroacoustic driver is coupled to the plate and causes the plate to execute linear vibratory motion at a high frequency, where the stiffness of the flexural members is resonant with the mass of the vibrated portions of the head. Due to the stiffness of the flexural member and the high frequency of vibration, the relative displacement of the mating surfaces to be joined during vibration can be extremely minute.

Abstract: An underwater, ultra low frequency acoustic signal projector utilizes a pmatically powered signal generator wherein slide and poppet valves cooperate to effect pressure excursions on a piston connected to a water contacting signal generating piston.The generator is constantly pneumatically referenced to ambient hydrostatic pressures by a pressure equilibrium control system. A compressor recycles generator exhaust to provide substantially bubble free operation.

Abstract: An ultrasonic whistle is mounted together with a pin on a window or door so that movement of the window or door causes relative movement between the whistle and pin. Such movement releases compressed gas from a container which activates the whistle. A central monitor in the building detects the output of the whistle and provides an output to activate alerting devices.

Abstract: A helix of wire having predetermined dimensions is encircled by a sleeve of selected material which conforms to the exterior surface configuration of the helix. When a gas is applied into one end of the helix-sleeve combination, an audio frequency signal appears at the other end of the helix-sleeve combination having a frequency which increases in steps proportional to the entrance pressure of the gas flowing through the helix-sleeve combination, or proportional the changes in the mass rate of flow of the gas through the helix-sleeve combination.

Abstract: An ultrasonic wave transmitter employs a resonant rod to generate an ultrasonic wave in response to the striking of an end thereof by means of a striking member. A striking member support employed for controlling the movement of the striking member relative to the end of the rod is selectively positioned in contact with the end of the rod to provide for damping thereof following each striking.