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1. (WO1992009988) IMPROVEMENTS IN ATTENUATORS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/009988 International Application No.: PCT/GB1990/001799
Publication Date: 11.06.1992 International Filing Date: 21.11.1990
Chapter 2 Demand Filed: 21.05.1992
IPC:
F01N 1/10 (2006.01) ,F01N 1/24 (2006.01) ,F02K 1/82 (2006.01) ,F16L 55/033 (2006.01) ,G10K 11/16 (2006.01)
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
N
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
1
Silencing apparatus characterised by method of silencing
08
by reducing exhaust energy by throttling or whirling
10
in combination with sound-absorbing materials
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
N
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
1
Silencing apparatus characterised by method of silencing
24
by using sound-absorbing materials
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02
COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
K
JET-PROPULSION PLANTS
1
Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
78
Other construction of jet pipes
82
Jet pipe walls, e.g. liners
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
L
PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
55
Devices or appurtenances for use in, or in connection with, pipes or pipe systems
02
Energy absorbers; Noise absorbers
033
Noise absorbers
G PHYSICS
10
MUSICAL INSTRUMENTS; ACOUSTICS
K
SOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
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
16
Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
Applicants:
SOUND ATTENUATORS LIMITED [GB/GB]; Eastgates Colchester Essex CO1 2TW, GB (AllExceptUS)
FRY, Alan, Trevor [GB/GB]; GB (UsOnly)
Inventors:
FRY, Alan, Trevor; GB
Agent:
NEWBY, John, Ross; J.Y. & G.W. Johnson Furnival House 14-18 High Holborn London WC1V 6DE, GB
Priority Data:
Title (EN) IMPROVEMENTS IN ATTENUATORS
(FR) AMELIORATIONS APPORTEES AUX AFFAIBLISSEURS
Abstract:
(EN) An acoustic attenuator has at least two masses (102, 103) of sound attenuating material located in a duct (101) with a gas passage provided between confronting surfaces of said at least two masses through which gas is intended to flow from an inlet region of the passage to an exit region (B) thereof, at least one of said confronting surfaces exhibiting a step (102b) producing a widening of the gas passage in the exit region.
(FR) Affaiblisseur acoustique possédant au moins deux masses (102, 103) d'un matériau à affaiblissement acoustique disposées dans un conduit (101), un passage à gaz étant prévu entre les surfaces de masse qui se trouvent en face les unes des autres, et destiné à permettre l'écoulement d'un gaz d'une zone d'entrée à une zone de sortie (B) dudit passage. L'une au moins des surfaces disposées en face l'une de l'autre présente un décrochement (102b) élargissant ledit passage à gaz dans la zone de sortie.
Designated States: AU, CA, NO, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
NO19931802EP0558472AU1991068761