Patents
Sitemap › G10 - Musical instruments; Acoustics › G10K - Sound-producing devices; methods or devices for protecting against, or for damping, noise or other acoustic waves in general; Acoustics not otherwise provided for › G10K 11 - Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
Patents for G10K 11 - Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general (21,150)
05/1991
05/29/1991EP0428991A2 Composite material of carbon fibers and method for producing the same
05/29/1991EP0428705A1 Centrifugal separator.
05/29/1991DE4018360C1 Porous metal body prodn. - involves compaction at low temp. followed by heating to near melting point of metal
05/28/1991US5020035 Transducer assemblies
05/28/1991US5020034 Directional antenna with multiple transducers, in particular for a sonar
05/28/1991US5020033 Large eddy break-up device for towed arrays
05/28/1991US5020032 Sonobuoy suspension system
05/22/1991EP0427766A1 Vibration damping materials
05/21/1991US5018203 Noise attenuation
05/21/1991US5018202 Electronic noise attenuation system
05/18/1991CA2028599A1 Isophonic air admission box with self controlled aeration
05/16/1991WO1991007066A1 Audio surveillance discouragement apparatus and method
05/16/1991DE4020881A1 Resonanzschwinger Resonance oscillator
05/15/1991EP0427649A1 Apparatus for the detection of objects using ultrasonic detectors
05/15/1991CN2076834U Multi-functional antinoise ear muffs
05/14/1991US5016225 Transducer mounting bracket
05/14/1991US5014953 Hinged-arm type of mechanism and sonar antenna fitted out with a mechanism such as this
05/14/1991US5014815 Acoustic liner
05/14/1991US5014814 Sound-damping machine parts
05/14/1991US5014712 Coded excitation for transmission dynamic focusing of vibratory energy beam
05/14/1991CA1284238C2 Method of treating an ultrasonic transducer element
05/08/1991EP0425716A1 Ultrasonic layered transducer with astigmatic sound lobe
05/08/1991EP0425697A1 Ultrasonic probe and method of producing the same
05/08/1991EP0425671A1 Device for ultrasonic treatment of articles in a liquid medium
05/08/1991EP0425600A1 Process and device for reducing the noise emission of submerged submarines.
05/08/1991EP0258438B1 Ultrasonic converter
05/07/1991US5014248 Air-deliverable, ice-penetrating sonobuoy
05/07/1991US5013597 Multi-layered sound-insulating panel for motor vehicles, or similar
05/07/1991CA1283894C Self-orienting device
05/07/1991CA1283867C Adaptor for coupling plural compression drivers to a common horn
05/02/1991EP0425129A2 Earphoning
04/1991
04/30/1991US5010977 Acoustic apparatus with plural resonators having different resonance frequencies
04/28/1991CA2027340A1 Earphoning
04/25/1991DE3935350A1 Ventilation housing e.g. for transformer - has built-in sound absorption provided by modules that form Helm hole resonator unit
04/25/1991DE3933474A1 Aus bauelementen zusammensetzbares fuellstandsmessgeraet For devices assembleable level measuring device
04/24/1991EP0424239A1 Beam forming method for sonar
04/24/1991EP0423902A1 Propellor blade position controller
04/24/1991EP0423172A1 Active noise reduction system.
04/24/1991CN1050887A Thermoplastic material for soundproofing and vibration insulating applications, and laminated and stratified products obtained fromit, particularly for motor vehicles
04/23/1991US5010576 Active acoustic attenuation system for reducing tonal noise in rotating equipment
04/23/1991US5010529 Underwater transmitter apparatus
04/23/1991US5009232 Extracorporeal lithotripsy apparatus using high intensity shock waves for calculus disintegration and low intensity shock waves for imaging
04/23/1991US5009084 Refrigerator
04/18/1991WO1991006192A1 Soft sonar suspension system
04/18/1991CA2067242A1 Soft sonar suspension system
04/17/1991EP0423057A2 Noise abating brake shoe
04/17/1991EP0422065A1 Frequency controlled motor driven low frequency sound generator.
04/16/1991US5008863 Low noise sonar support system
04/11/1991WO1991005819A1 Thermoplastic mass for applications of sound-proofing and vibration isolation and laminated and stratified materials obtained therefrom, particularly for motor vehicles
04/11/1991CA2044134A1 Thermoplastic material for sound-proofing and vibration insulating applications, and laminated and stratified products obtained from it, particularly for motor vehicles
04/10/1991EP0421887A1 Acoustic isolation for protecting the usable compartment of a rocket
04/10/1991EP0421290A1 Ultrasonic shock wave transducer
04/10/1991EP0421286A2 Piezoelectric transducer
04/10/1991EP0421279A1 Ultrasonic diagnostic apparatus with selective focussing patterns
04/09/1991US5005666 Attenuation of borehole tube-waves
04/09/1991US5005439 Inertia force generating device
04/07/1991WO1991005226A1 Level indicator comprising several separable components
04/05/1991WO1991005268A1 Underwater profile detector device
04/05/1991CA2067130A1 Underwater profile detector device
04/04/1991DE4029575A1 Differential-housing-supporting structure - has first buffer absorbing torque reaction and second softer one damping particular frequency
04/03/1991EP0420758A1 Ultrasonic coupler and method for production thereof
04/03/1991EP0420346A1 Ultrasonic echograph with digital reception beam former
04/03/1991EP0420023A1 Apparatus for destroying calculi
04/02/1991CA1282281C Spatially addressable capillary wave droplet ejectors and the like
04/02/1991CA1282207C Method of acoustically insulating a toilet bowl
03/1991
03/26/1991US5003516 Ultrasonic probe and manufacture method for same
03/26/1991US5003285 Transducer array
03/26/1991US5001933 Micromechanical vibration sensor
03/26/1991US5001932 Ultrasonic squirter
03/26/1991CA1282161C Active sound attenuation system with on-line adaptive feedback cancellation
03/21/1991WO1991003808A1 Absorbant acoustic material and anechoic coating using same
03/21/1991DE3930242A1 Insulating plate for ultrasound absorption in liq(s). - contains reverberatory non-porous particles in vulcanised rubber matrix and presents no perpendicular surfaces to the sound
03/20/1991EP0418141A1 Method for sonar beam forming, particularly for towed sonar
03/20/1991EP0417225A1 Process and device for reducing the noise emission of submerged submarines.
03/19/1991US5001763 Electroacoustic device for hearing needs including noise cancellation
03/19/1991US5001680 Compliant tube baffle
03/19/1991US5000045 Acoustic emission waveguide
03/16/1991CA2025339A1 Beam forming method for a sonar, particularly a towed sonar
03/13/1991EP0416487A2 Sound transducer
03/12/1991US4999816 Hydrophone deployment system for a sonobuoy
03/12/1991CA1281294C Active attenuation system with on-line modeling of speaker, error pathand feedback path
03/07/1991WO1991003578A1 Lightweight foamed metal and its production
03/07/1991WO1991002489A1 Intravascular ultrasonic imaging probe
03/06/1991EP0415237A2 Active noise control apparatus for domestic appliance
03/06/1991EP0414865A1 Process for masking the noise signals emitted by the sound-emitting mechanical elements of a vehicle, in particular a submerged submarine, and submarine.
03/05/1991WO1991003360A1 Method of manufacturing glass reinforced concrete building products
03/05/1991US4997705 Septa sandwiching core; underwater sonar systems
03/05/1991US4997402 Telescoping horn
03/05/1991US4997056 Ear-focused acoustic reflector
03/05/1991CA2065238A1 Method of manufacturing glass reinforced concrete building products
03/05/1991CA1281118C Axial borehole televiewer
03/01/1991CA2021235A1 Multiplexed surface acoustical wave apparatus
02/1991
02/28/1991DE4026070A1 Active noise reduction system for vehicle passenger - uses weighing of microphone signals to simulate virtual source at position of passengers head
02/27/1991EP0414526A2 Boom microphone
02/27/1991EP0414479A2 High compliance headphone driving
02/27/1991EP0414261A2 Ultrasonic diagnosing apparatus
02/26/1991US4996673 Underwater control system
02/25/1991CA2023454A1 Reducing microphone puff noise
02/24/1991CA2023142A1 High compliance headphone driving
02/21/1991WO1991002264A1 Apparatus for sensing underwater objects
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