NOISE ATTENUATION DEVICE WITH ACTIVE DOUBLE WALL - Patent 0697122

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EP 0 697 122 A1

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(43)	Date of publication:
	21.02.1996 Bulletin 1996/08

(21)	Application number: 94915585.0

(22)	Date of filing: 04.05.1994

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International Patent Classification (IPC):

G10K 11/ 178^{( . )}

(86)	International application number:
	PCT/FR1994/000520

(87)	International publication number:
	WO 1994/027283 (24.11.1994 Gazette 1994/26)

(84)	Designated Contracting States:
	AT BE CH DE ES FR GB IT LI NL

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Priority:

06.05.1993 FR 19930005451

(71)	Applicant: CENTRE SCIENTIFIQUE ET TECHNIQUE DU BATIMENT
	F-75782 Paris Cédex 16 (FR)

(72)	Inventors:
	BOUVET, Pascal F-69003 Lyon (FR) ROLAND, Jacques F-38700 Corenc (FR) GAGLIARDINI, Laurent F-75010 Paris (FR)

(74)	Representative: Loisel, Bertrand
	Cabinet Plasseraud, 84, rue d'Amsterdam F-75440 Paris Cédex 09 F-75440 Paris Cédex 09 (FR)

(54)	NOISE ATTENUATION DEVICE WITH ACTIVE DOUBLE WALL