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Actor Marlon Brando has four patents, all named "Drumhead tensioning device and method."
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| Number | Title | Issue Date |
| 6002645 | Self survey of random arrays A method for determining the positions of the N array elements of a random rray to an accuracy sufficient to accomplish beam forming is provided where the initial positions of the array elements are known to an accuracy of λmin/2, and where λ | 12/14/1999 |
| 5142497 | Self-aligning electroacoustic transducer for marine craft A transducer apparatus for marine pleasure craft employs only gravity-induced forces to always orient its electroacoustic transducer in a downward direction or other predetermined direction. The apparatus mounts on the transom or hull of a pleasure craft,... | 08/25/1992 |
| 5077695 | Near field scanning acoustic microscope and method An acoustic microscope in which acoustic energy is focused onto a membrane which includes an aperture which is a fraction of the size of the focal spot of the acoustic beam at the membrane to form fringing fields on the other side of the membrane. Acousti... | 12/31/1991 |
| 5025425 | Sonic detection and tracking system Two submerged rotatable sets of transmitting and receiving transducers are ongitudinally spaced along the side of a river to establish intersecting lateral sonar beams obliquely oriented at opposing 45° angles relative to the primary river current. Each b... | 06/18/1991 |
| 5023616 | Microphone amplifier detector A device for detecting a covert transmitter having a time varying impedance therein including a radio frequency transmitter and an audio frequency transmitter which are directed so as to illuminate a target area. The audio tone drives the active elements ... | 06/11/1991 |
| 5022015 | Sonar system of the type using hollow conical beams Sonar apapratus which forms concentric hollow conical receiver beams having a common cone axis which is at a predetermined angle relative to the direction of travel of the apparatus as opposed to being coincident with it. A target indication received by a... | 06/04/1991 |
| 5020032 | Sonobuoy suspension system A sonobuoy suspension system is disclosed wherein a spring motor having a substantially constant output torque is mounted within an upper sonobouy unit secured to a buoyant flotation member. Formed from a coiled band, constant force extension spring wound... | 05/28/1991 |
| 5018114 | Adjustable frequency diversity acoustic communications system An underwater acoustic communication system provides an operator with adjable frequency diversity so that data rates may be tailored to specific multipath environments. Transmitted messages are sent with precursor transmission/reception synchronization d... | 05/21/1991 |
| 5016227 | Top mounted buoy signaling device A top mounted buoy signaling device for marine navigation which is selectively activated in response to a coded address signal. The buoy signaling device includes a buoy having a top mounted receiver assembly which is activated by a transmitter assembly. ... | 05/14/1991 |
| 5014250 | Acoustic detection device A sonar system has k acoustic detectors (1) for the detection and conversion of acoustic signals into electrical signals s(k), a beamforming unit (3), a frequency analysis unit (4), which uses the signals s(k) to generate signals s($c;i, f | 05/07/1991 |
| 5012449 | Sonic flow meter A gain-controlled amplifier (24) in a sonic flow meter accepts an output signal from each transducer of a plurality of pairs of transducers (1a, 1b; 2a, 2b; 3a, 3b; and 4a, 4b) in sequence. A ramp generator (62) generates a time-varying-gain output, which... | 04/30/1991 |
| 5010529 | Underwater transmitter apparatus Underwater signal apparatus includes a waterproof housing having two chambers, a sealed chamber in which is disposed a transducer and electrical circuitry associated with the transducer. In the second chamber is a battery for providing the necessary elect... | 04/23/1991 |
| 5010525 | Sonar test system and method A single test transducer or a line array of test transducers is placed above the transducers of an array under test and provided with a simulated flow noise signal. The response of all of the transducers under test is derived and stored whereupon the test... | 04/23/1991 |
| 5007032 | Acoustic alert sensor An acoustic detector for detecting acoustic signals produced by vehicles. The detector comprises an acoustic sensor which senses an acoustic signal which is provided to a zero crossing detector. The zero crossing detector provides a digital signal represe... | 04/09/1991 |
| 5007029 | Undersea relocation apparatus & method The present invention relates to a undersea relocation system and more particularly relates to an apparatus for relocating underwater objects by means of a retrievable line carrying buoyant spool which is released to the surface responsive to a remote sig... | 04/09/1991 |
| 5003515 | Submarine emergency communication transmitter An underwater acoustic transmitter adapted to be released from a submerged ubmarine to float towards the surface of the water and explode a plurality of signalling charges at a predetermined depth in a predetermined time sequence.... | 03/26/1991 |
| 5003514 | Deep ocean recoverable acoustic sensor vehicle A deep ocean recoverable, tethered acoustic sensor system launchable from aircraft or ship. Upon water entry, the system separates into an upper flotation module containing a receiver/transmitter, antenna and inflatable bag, and a lower flotation module ... | 03/26/1991 |
| 5001678 | System for detecting surrounding environmental conditions using a multiple number of incoming signals A detection system forms a plurality of reception beams successively in angular directions by receiving incoming signals from various directions in a manner that the Doppler effect is produced to vary the carrier frequency of the incoming signals. The det... | 03/19/1991 |
| 4999818 | Ultrasonic pest repeller A relatively simple but highly effective circuit for producing ultrasonic signals which are utilized to repel pests and vermin. The frequency of the signals is sufficiently high to be undetected by humans and most domestic animals and pets.... | 03/12/1991 |
| 4999816 | Hydrophone deployment system for a sonobuoy A sonobuoy is disclosed which has a linear array of hydrophones horizonta depolyable at sea by a metal hydride jet thruster. The thruster is powered by releasing hydrogen gas from iron-titanium hydride (FeTiH1.95) and igniting it in a mixture ... | 03/12/1991 |
| 4998225 | Dual beam doppler shift hydrophone A dual beam hydrophone wherein a reference laser beam and a signal laser m are both modulated simultaneosuly by the movement of reflecting surfaces responding to pressure variatrions due to an impinging acoustic wave. Each beam, travels the same path len... | 03/05/1991 |
| 4998224 | System for providing improved reverberation limited sonar performance Apparatus and method for providing increased gains in detection and classcation of active sonar targets while concurrently preventing target cognizance of detection. Operation starts with transmission of a sequence of FM slides as subpulses alternately u... | 03/05/1991 |
| 4996673 | Underwater control system An underwater control system is disclosed. The system find particular applications in mosaic photographic and/or acoustic mapping of seabed or such marine studies, explorations, etc. A submersible vehicle is tied to a fixed central unit by a tether. The t... | 02/26/1991 |
| 4995011 | Acoustic mapping system using tomographic reconstruction A technique for the non-intrusive position determination of one or more natural or artificial acoustic transmitters (S1, S2, S3) in marine or terrestrial environments by processing data from five or more receivers (R1, R2, R3, R4, R5) distributed in the a... | 02/19/1991 |
| 4993325 | Magnetic field generator This invention discloses a magnetic field generator employing a direct cunt electromagnetic coil which is swept through a predetermined area by a drive motor and transmission means. Circuit means are disclosed to periodically reverse the polarity of the ... | 02/19/1991 |
| 4995010 | Depth finding-trolling system A depth finding-trolling system for measuring the water depth and operating a trolling motor. The depth finder and trolling motor are configured within a unitary structure having dimensions of a conventional trolling motor. The depth finder includes an au... | 02/19/1991 |
| 4992988 | Underwater acoustic control system An underwater acoustic control system for use in a subsurface unit receiv coded signals. A hydrophone receives the signal and enables an electronics package to supply a control pulse which could activate a switch or fire a squib. A timer is included in t... | 02/12/1991 |
| 4992999 | Submarine drone for carrying a barrel stave-type transducer array A submarine drone has special hydrodynamic performance features for operag as a moving underwater platform for underwater transport of a barrel stave type sonar receiving transducer and a pole type sonar transmitting transducer with highly precise vertic... | 02/12/1991 |
| 4992989 | Ultrasound probe for medical imaging system An ultrasound probe for a medical imaging system, comprising an ultrasound absorber and a piezoelectric vibrator mounted on the ultrasound absorber, cut in the direction from the surface of the piezoelectric vibrator to the ultrasound absorber into an arr... | 02/12/1991 |
| 4992998 | Acoustic range finding system In acoustic level sensing apparatus, in which pulses of acoustic energy are transmitted by an electrically energized transducer towards a surface to be sensed, and the electrical output from the transducer following the pulse is digitized and analyzed to ... | 02/12/1991 |
| 4991148 | Acoustic digitizing system An acoustic position sensing apparatus is described which determines the position of an indicator in relation to a datum surface or volume. The apparatus comprises an acoustic point source transmission device mounted on the indicator for transmitting a se... | 02/05/1991 |
| 4991143 | Mobile target acoustic system This system is directed to an acoustic target simulator for use with active nd passive sonar systems. A receiver and a transmitter are mounted on the front and rear of the simulator. Separate high frequency channels are provided for the front transmitter a... | 02/05/1991 |
| 4991146 | Intrusion detection system A microprocessor-based ultrasonic intrusion detection system includes an initialization mode wherein a plurality of echoes are cumulatively processed to produce a reference or signature data set representing the area to be monitored without intruding obje... | 02/05/1991 |
| 4991144 | Dopplerized echo repeater The present invention relates generally to submarine simulating decoy and particular is a sonar system for receiving the acoustical search pulse from an enemy or other vehicle and converting it into a dopplerized sonar signal which is then broadcast back... | 02/05/1991 |
| 4991149 | Underwater object detection system Propagation of modulated radiation from a platform is substantially limited o unidirectional transmission through a body of water. Acoustical energy is generated at the surface of a remote object submerged in the water in response to impingement and absorp... | 02/05/1991 |
| 4989186 | Target tracking sonar with false target detector A target tracking sonar system associated with a moving platform incorporates a Kalman filter model and a false target detection capability characterized by comparison of the estimated and actual acceleration to produce an error value which, if greater th... | 01/29/1991 |
| 4986755 | Acoustic target doppler simulator It is useful to a sonar instructor to have a device which simulates Doppler hifting of recorded sonar signals. Such a device can consist of a digitizer operating at a fixed rate storing data in RAM. A variable read rate is calculated based on the desired D... | 01/22/1991 |
| 4987563 | Synthetic aperture minimum redundancy sonar apparatus A sonar system including an elongated transducer having a fully populated or non-fully populated array of transducer elements. During course of travel of the carrier on which the transducer is mounted, successive acoustic transmissions take place whereupo... | 01/22/1991 |
| 4985874 | Solid state sequencing switch A combination of integrated circuit (IC) flatpacs used in combination to tch selected sonar microphone inputs from a circular receiving array to position a beam containing a sounding target intermediate to an equal number of left and right microphone pic... | 01/15/1991 |
| 4982384 | Split beam sonar A sonar system is disclosed that includes contiguously angularly disposed d oppositely rotated transmitting and receiving transducers for broadcasting an acoustic signal and for receiving target echoes thereof, respectively, at different angles from withi... | 01/01/1991 |
