(19)
(11) EP 1 636 496 A1

(12)

(43) Date of publication:
22.03.2006 Bulletin 2006/12

(21) Application number: 04736844.4

(22) Date of filing: 15.06.2004
(51) International Patent Classification (IPC): 
F04D 29/02(1968.09)
F04D 19/04(1968.09)
(86) International application number:
PCT/GB2004/002495
(87) International publication number:
WO 2005/001294 (06.01.2005 Gazette 2005/01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

(30) Priority: 25.06.2003 GB 0314692

(71) Applicant: The BOC Group plc
Windlesham Surrey GU20 6HJ (GB)

(72) Inventors:
  • SCHOFIELD, Nigel Paul
    West Sussex RH12 2NT (GB)
  • OKOROAFOR, Emmanuel Uzoma
    Bedfordshire MK41 7JT (GB)
  • LIU, Michael Chung Kau
    West Sussex RH16 3AE (GB)
  • HUNTLEY, Graeme
    Somerset TA6 7PH (GB)

(74) Representative: Booth, Andrew Steven 
The BOC Group plc, Chertsey Road
Windlesham, Surrey GU20 6HJ
Windlesham, Surrey GU20 6HJ (GB)

   


(54) ROTARY IMPELLER FOR A TURBOMOLECULAR PUMP