Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 5973999 | Acoustic cannon An acoustic cannon has a plurality of acoustic sources with output ends symmetrically arranged in a planar array about a central point. Pressure pulses are generated in each acoustic source at substantially the same time. The pressure pulses exit the outp... | 10/26/1999 |
| 5613940 | Synthesizing array for three-dimensional sound field specification A non-invasive, synthesizing array of "N" reciprocal transducers is driven by "N" linearly independent inputs for three-dimensional sound field specification at "N" locations either within, or on, an isotropic or anisotropic acoustic/elastodynamic medium.... | 03/25/1997 |
| 5595585 | Low frequency sound distribution of rotary fiberizer veils A method and device is disclosed for distributing a veil by applying low frequency sound to at least one portion of the veil, and causing the veil to deviate in its generally downward direction of travel. In its simplest embodiment, the lapping device of ... | 01/21/1997 |
| 5484969 | High-volume acoustic transducer A high-volume source for very low frequency applications in which conventional speakers are inadequate is disclosed. A presently preferred embodiment comprises a reservoir 32 with a pressure relief 33; a controller 34; a supply blower 36; an exhaust blowe... | 01/16/1996 |
| 5350887 | Method and apparatus for the generation of low frequency sound The invention relates to a method and apparatus for the generation of low frequency sound by means of the excitation of a low frequency standing gas borne sound wave. A low frequency sound generator comprises a resonator part and a feeder part with a feed... | 09/27/1994 |
| 5321388 | High efficiency phase and amplitude matched multiple horn electronic siren An electronic siren apparatus has a primary horn with a throat which splits into matched secondary horns each having sides, an output end, a longitudinal axis, and a circumference. The secondary horns are folded back toward and around the primary horn and... | 06/14/1994 |
| 5246595 | Process for degassing a coupling liquid of a pressure wave generator apparatus employing coupling liquid by chemical route, coupling liquid thus treated and shock wave generator using such a coupling liquid A process for degassing a coupling liquid is disclosed, comprising adding to said coupling liquid at least one chemical substance readily taking up gas in a sufficient quantity to absorb said gas substantially completely. This chemical substance is prefer... | 09/21/1993 |
| 5233570 | Low frequency underwater acoustic radiator Low frequency underwater acoustic radiator apparatus includes an air-trapping chamber with a lower portion open to the water, characterized by a mean density higher than that of water. A closed, rigid float element having a mean density equal to or lower ... | 08/03/1993 |
| 5214620 | Electrically driveable shockwave source An electrically driveable shockwave source for generating acoustic shockwaves of the type suitable for medical therapy, as a coil arrangement and a membrane disposed adjacent the coil arrangement. The membrane and/or the coil arrangement is formed by a mu... | 05/25/1993 |
| 5200932 | Underwater audible signalling device A signalling device with a long audible range is described, which is intended for underwater communication between divers. The device consists of a compact and lightweight horn and a rubber bulb. The horn, which works independently from a diver's supply o... | 04/06/1993 |
| 5109948 | Frequency controlled motor driven low frequency sound generator The invention relates to a frequency controlled motor driven low frequency sound generator. The low frequency sound generator consists of an open resonator (2) arranged as a sound emitter for generating standing gas-borne sound waves which produce a varyi... | 05/05/1992 |
| 5081900 | Resonance damage process A method and system for the production of stress waves in a solid target employs a pulsed source of coherent photon energy. the pulse repetition frequency of the photon energy is chosen in dependence upon the physical dimension and nature of the selected ... | 01/21/1992 |
| 4938136 | Resonant acousticmagnetic minisweeper A system for sweeping acoustic and magnetic mines or a combination of both s disclosed as comprising a pair of spatially disposed magnetic pipes that are held in their respective spatial dispositions by front and rear straps, and an acoustical energy gener... | 07/03/1990 |
| 4852973 | Diffraction free arrangement Arrangements are disclosed for generating a well defined traveling wave beam substantially unaffected by diffractive spreading. In different embodiments, the beam can be an electromagnetic wave, particle beam, a transverse beam, a longitudinal beam such a... | 08/01/1989 |
| 4796725 | Electrostatic transducer An electrostatic transducer which includes a vibrating membrane provided between a fixed electrode and a movable electrode to which electric signals are applied. The transducer further includes a plurality of depressions provided concentrically with a cen... | 01/10/1989 |
| 4755973 | Space surveillance apparatus with sound source and method of short-range space surveillance A space surveillance apparatus includes at least one source of sonic radiation driven by a driver circuit as well as a processing or evaluation circuit. Upon movement of an object, or presence of a foreign object within a monitored space, the processing c... | 07/05/1988 |
| 4713799 | Ultrasonic horn with sidelobe suppressing centerpiece An ultrasonic horn assembly includes a horn with a bore tapering from a throat out to a mouth. An ultrasonic transducer is mounted in the throat of the horn. A beam narrowing insert includes a headpiece which tapers smoothly from a larger diameter base to... | 12/15/1987 |
| 4541687 | Signal processing system and method A system for processing of multifrequency input signals to provide a Fourier transform output is provided which can, for example, partition a wide input frequency band into a number of narrow bands and concurrently detect the presence of one or more signa... | 09/17/1985 |
| 4462483 | Solid propellant sound generator for coagulation of aerosols A solid propellant gas generator operating with a calibrated tunable resonator produces a strong sonic field capable of affecting particle coagulation in an aerosol. The resonator is calibrated to produce a sonic field at the optimum frequency for a given... | 07/31/1984 |
| 4400804 | Driver for high power sonar systems A high power sonar pulse generator driven by a low power electrical motor erein a flywheel, placed in the mechanical system, connects the small motor and large generator. Since the large power output from the pulse generator is required only intermittentl... | 08/23/1983 |
| 4387785 | Optical device for monitoring critical speeds of a rotating member An optical device for monitoring the speed of a rotating member characterized by a reflector mounted on a surface of the rotating member adjacent the periphery to travel in a circular path, a light source creating an input beam and either directing it at ... | 06/14/1983 |
| 4387451 | Low frequency nonresonant acoustic projector A nonresonant acoustic projector especially suited to the creation of low frequency (0-100 Hz, approximately) acoustic signals is provided, this projector including a housing and a rocker arm which is mounted within the housing on a pivotal transverse axi... | 06/07/1983 |
| 4384633 | Perforated acoustic transport member An improved acoustic transport member for use in a keyboard having key operated strikers individually actuatable for inducing acoustic energy in the form of sound waves which propagate through the member from selected inducing positions therealong. A firs... | 05/24/1983 |
| 4376469 | Stepped acoustic transport member An acoustic transport member for use in a keyboard having key operated strikers individually actuatable for inducing acoustic energy in the form of sound waves which propagate through the member from selected inducing positions therealong. A first portion... | 03/15/1983 |
| 4202047 | Acoustic jammer and torpedo decoy 1. An acoustic decoy adapted to operate underwater, said decoy comprising a otor means, a circular spindle means connected to said motor means and adapted to be rotated thereby, said spindle means having a pair of axially aligned spaced parallel discs, a p... | 05/06/1980 |
| 4196789 | Protection by underwater sound waves Underwater protection for ships, for channels at harbor entrances and the like is obtained by the use of this invention in which one or more sending wires are put under tension under water and a mechanical vibration is applied to each sending wire longitu... | 04/08/1980 |
| 4169662 | Method and apparatus for producing acoustic waves by laser pulses Focussed acoustic waves are generated free of physical contact in a light absorbing workpiece by the use of laser beam means providing a coherent light beam which in a pulsed manner impinges upon the surface of the workpiece in a Fresnel zone pattern. The... | 10/02/1979 |
| 4160411 | Sound signal body for generating underwater sound signals A sound signal body, for generating underwater sound signals, that includes an explosive body which can be thrown out or released by hand. Within the explosive body is arranged an explosive charge as well as a hand grenade detonator having a pyrotechnical... | 07/10/1979 |
| 4137991 | Clamped acoustic elastic wave generator A pulse of energy including atomic, thermal or electromagnetic radiation produced by a source such as an electron or atomic beam, laser, electrical or optical means is applied to a generator. The generator includes a body of material adapted for acoustic ... | 02/06/1979 |
| 4053027 | Use for a seismic energy pulse generator for generating and shaping a seismic energy pulse In seismic delineation of sedimentary section below the surface of a seismic energy propagation medium, a new use for an old article is disclosed. It includes a basic method for generating and shaping a seismic energy pulse comprising (1) generating a fir... | 10/11/1977 |
| 4049077 | Seismic vibrator control system This invention is a control system for a hydraulic vibrator that permits the injection into the ground of seismic signals having pseudo-random code patterns or other broad band signals. Feedback for controlling vibrator operation is taken from the couplin... | 09/20/1977 |
| 4047592 | Self-driven underwater noisemaking device An underwater noisemaking device that is self-driven for use in towed undater acoustic minesweeping or as a decoy countermeasure device. It comprises a cambered and slotted disc mounted in a frame so as to be free to rotate about a horizontal, transverse... | 09/13/1977 |
| 4014403 | Vibratory apparatus for use in seismic exploration In a variable frequency seismic vibrator including an earth coupling plate, means for generating a reaction impedance, and an energy source for generating reciprocating movement of the coupling plate relative to the reaction impedance, the reaction impeda... | 03/29/1977 |
| 3997021 | Pressurized gas discharging apparatus for use as a down-bore seismic impulse source Improved pressurized gas discharging apparatus for use as a down-bore seismic impulse source provides a compact, efficient axially stacked assembly of components within a one piece elongated tubular shell housing having removable end closures. Within the ... | 12/14/1976 |
| 3946829 | Ultrasonic device An ultrasonic device for convergently radiating ultrasonic energy including a metallic ring vibrated to resonance by at least one electromechanical transducer fixed on the outer circumference of the ring, thereby to deliver high power ultrasonic waves fro... | 03/30/1976 |
