Matches 201 - 250 out of 255 < 1 2 3 4 5 6 >


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3909773 Underwater teletype communication system  
A diver-carried underwater communication system employs a visual read-out transmitted and received messages. The individual message elements are selected by a keyboard control device and are...
3893062 Transmission system  
A transmission system uses a carrier frequency subject to periodic variations according to a predetermined variation law. A local receiver frequency is also subject to periodic variations...
3893061 Underwater acoustic detection system  
An underwater acoustic detection system having remotely located passive detection field units submerged underwater and a centrally located receiving station having an underwater receiver. The...
3878502 Ultrasonic temperature telemetry system  
A temperature-sensitive implantable fish tag has been provided which employs a sensing thermistor located at the end of a flexible appendage which varies the repetition rate of an acoustic...
3842398 APPARATUS AND METHOD FOR DEPLOYMENT OF EXPENDABLE VELOCIMETER TO ELIMINATE DOPPLER SHIFT ERROR IN THE MEASUREMENTS  
A correction is applied to a sound velocity vs. depth profile in order to eliminate a Doppler shift caused by the relative speed between a transmitter on a velocimeter dropping through the ocean...
3811106 UNDERWATER LOW FREQUENCY SONIC COMMUNICATION  
This invention relates to very low frequency sound wave signaling and comication through sea water over long distances.
3810146 ALARM SYSTEM FOR THE SAFETY OF NON-SWIMMERS  
An alarm system for the safety of non-swimmers comprises a portable transmitter which is adapted to be attached to the body of the non-swimmer and to be activated on immersion in water, and a...
3786406 AUTOMATIC DEVICE FOR SIGNALING FROGMAN ACCIDENTS  
A novel system for detecting frogman accidents is disclosed. The system comprises an electronic sending system which emits an regualar acoustical signal, provided that the submerged frogman...
3745518 METHOD FOR DETERMINING THE DISTANCE BETWEEN A VESSEL AND A REFERENCE POINT AND DEVICE FOR CARRYING OUT THIS METHOD  
Method for determining the deviation distance of a vessel from a preselected point defined with respect to a set of sensors immersed in a predetermined position, comprising transmitting acoustic...
3742440 SYSTEM FOR ACTIVATING A REMOTE UNDERWATER DEVICE  
A system for activating a remote underwater device using a frequency coded acoustic wave generator having at least one notch frequency in the transmission spectrum. The generator is adapted to...
3736551 SWIMMERS TACTILE COMMAND NAVIGATION APPARATUS  
A command navigation apparatus including a back pad; a plurality of tactile ndicators mounted in the back pad for providing tactile sensory indicators on the back, the tactile indicators being...
3728549 IN SITU DEVICE FOR MEASURING LIGHT SCATTERING  
A self-contained, telemetering, fixed small angle forward scatterance meter or furnishing real-time data on light scattering intensity is provided. Collimated light from a laser is directed...
3688029 CABLELESS ACOUSTICALLY LINKED UNDERWATER TELEVISION SYSTEM  
A cableless television system for viewing an underwater scene and acoustically transmitting data indicative of the scene to the surface for substantially immediate presentation. The system...
3686656 SUNKEN VESSEL LOCATOR  
A sound-generating instrument for use on a boat or other watercraft arranged to operate only if the boat is submerged, and which generates a sound under water to aid in locating and recovering the...
3673552 METHOD AND APPARATUS FOR COMPILING MEASURED VALUES OF A VARIABLE PARAMETER  
A method and apparatus primarily intended for commercial fishing craft for compiling at an observation station measured values of a variable parameter existing at one or more measuring locations...
3656097 SIGNAL PROCESSING SYSTEM FOR EXTRACTING A PERIODIC SIGNAL OF UNKNOWN FREQUENCY FROM A HIGH LEVEL BACKGROUND NOISE  
A detector identifies the frequency of a periodic signal buried beneath the threshold of background noise. A correlator compares the frequency of the output of a sweep generator with the incoming...
3641427 ELECTRIC FIELD SENSOR  
The invention is a method and means for sensing and measuring an electric eld within sea water or any other environmental medium. It contains three pairs of diametrically opposed electric current...
3611276 INSTRUMENT FOR DIRECT MEASUREMENT OF THE VELOCITY OF SOUND IN A FLUID  
The invention provides a free-falling underwater body which has a weight-drag characteristic that causes a stable rate of fall through water. The body contains an oscillator connected to a...
3602876 METHOD OF DETERMINING TERMINAL VELOCITY OF A FREE-FALLING BODY  
The disclosure concerns a method for determining the terminal velocity in ter of bodies having various hull shapes through the use of doppler techniques wherein a coherent oscillator on the body...
3593256 DOPPLER CORRECTION TECHNIQUE  
Method and means for complete correction of Doppler shift in a transmitted pectrum of individual frequencies, or tones, constituting a multitone, coded pulse system in which the lowest (reference)...
3541500 UNDERWATER COMMUNICATION AND CONTROL  
3517378 UNDERWATER LONG-DISTANCE SOUND-DETECTION SYSTEM  
3512125 UNDERWATER ACOUSTIC TELEMETERING SYSTEM  
3561268 EXPENDABLE BATHYTHERMOGRAPH  
3483837 STREAMLINED MISSILE DEVICE FOR LOCATION OF SUBMARINES  
3469231 UNDERWATER LOCATING AND INTERCOMMUNICATING DEVICE,PARTICULARLY FOR FREE-SWIMMING DIVERS  
3469189 METHOD AND SYSTEM FOR COMMUNICATION OF INFORMATION UTILIZING PULSE COMPRESSION PRINCIPLES  
3455151 EXPENDABLE OCEAN BOTTOM SENSOR  
3444510 MULTICHANNEL UNDERWATER ACOUSTIC TELEMETERING SYSTEM  
3441901 SYSTEM FOR MEASURING SOUND VELOCITY IN WATER AS A FUNCTION OF DEPTH  
3364744 Expendable bathythermograph  
3341808 Telemetering apparatus  
3336571 Underwater acoustic signaling system  
3329827 Decoder circuits  
3308667 Temperature determination system  
3305634 System and method of code communication  
3293595 Telemetering system  
3289152 Acoustic signaling system  
3281766 Communication system  
3273393 Bathythermograph  
3273112 Tuned seismic wave communication system  
3267420 Depth measuring apparatus  
3230500 Transmission of telephony spectrum over vlf channels  
3202040 Submarine positioner system  
3144171 Acoustic warning assembly for skin diving apparatus  
3135943 Underwater thermometric apparatus  
3133261 Depth finder of a vehicle in a fluid  
3098993 Sonobuoy-bathythermograph system  
3070773 Telemetering transmitter  
3069657 Selective calling system  

Matches 201 - 250 out of 255 < 1 2 3 4 5 6 >