CENTRIFUGAL FAN WITH AIRFOIL VANES IN ANNULAR VOLUTE ENVELOPE - Patent 0458880

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EP 0 458 880 A1

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(43)	Date of publication:
	04.12.1991 Bulletin 1991/49

(21)	Application number: 90903670.0

(22)	Date of filing: 05.02.1990

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International Patent Classification (IPC):

F04D 17/ 16^{( . )}
F04D 29/ 58^{( . )}

F04D 29/ 44^{( . )}

(86)	International application number:
	PCT/US1990/000659

(87)	International publication number:
	WO 1990/009526 (23.08.1990 Gazette 1990/20)

(84)	Designated Contracting States:
	DE ES FR GB IT SE

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Priority:

14.02.1989 US 19890310827

(71)	Applicant: AIRFLOW RESEARCH & MANUFACTURING CORP.
	Watertown, MA 02172 (US)

(72)	Inventor:
	YAPP, Martin, G. Needham, MA 02192 (US)

(74)	Representative: Deans, Michael John Percy
	Lloyd Wise, Tregear & CO. Norman House 105-109 Strand London WC2R OAE London WC2R OAE (GB)

(54)	CENTRIFUGAL FAN WITH AIRFOIL VANES IN ANNULAR VOLUTE ENVELOPE