EP 0817164 B2 20040825 - Noise absorbing structures and walls made therefrom
Title (en)
Noise absorbing structures and walls made therefrom
Title (de)
Geräuschabsorbierende Strukturen und daraus hergestellte Wände
Title (fr)
Structures d'absorption de bruit et parois constituées de ces structures
Publication
Application
Priority
FR 9608064 A 19960628
Abstract (en)
[origin: EP0817164A1] The structure has a membrane (10) which is sealed onto a fixed supporting shell (12) so the sound is directed onto the external surface of the membrane. Plates are positioned within the shell a short, modifiable distance from the membrane. Alternatively, there may be a closed chamber with a passage or a channel between two adjustable plates linking it to an inner chamber. The membrane may carry rods which enter fixed tubes closed at the lower end where they are attached to the shell. The internal volume between the membrane and the base (18) may be adjusted by an inflatable air-filled balloon or bellows (26) connected to the exterior by a hole (28). Electrical conductors or circuit boards are printed or positioned on the membrane.
IPC 1-7
IPC 8 full level
G10K 11/172 (2006.01)
CPC (source: EP US)
G10K 11/172 (2013.01 - EP US)
Citation (opposition)
Opponent :
- DE 4228356 A1 19940303 - DEUTSCHE AEROSPACE [DE]
- DE 9418063 U1 19950119 - WILHELMI WERKE GMBH & CO KG [DE]
- DE 9414943 U1 19960118 - FAIST M GMBH & CO KG [DE]
- EP 0244755 B1 19910206
- DE 2834823 B1 19791025 - MESSERSCHMITT BOELKOW BLOHM
- US 4068736 A 19780117 - DEAN RAYMOND H, et al
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 0817164 A1 19980107; EP 0817164 B1 20011128; EP 0817164 B2 20040825; CA 2209302 A1 19971228; CA 2209302 C 20101214; DE 69708523 D1 20020110; DE 69708523 T2 20020613; DE 69708523 T3 20050609; FR 2750527 A1 19980102; FR 2750527 B1 19980821; US 6332027 B1 20011218
DOCDB simple family (application)
EP 97401411 A 19970619; CA 2209302 A 19970626; DE 69708523 T 19970619; FR 9608064 A 19960628; US 390098 A 19980107