IMPROVEMENTS IN VALVES - Patent 1301685

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EP 1 301 685 A2

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(88)	Date of publication A3:
	30.05.2002

(43)	Date of publication:
	16.04.2003 Bulletin 2003/16

(21)	Application number: 01951806.7

(22)	Date of filing: 20.07.2001

(51)	International Patent Classification (IPC)⁷: E21B 34/06

(86)	International application number:
	PCT/GB0103/283

(87)	International publication number:
	WO 0200/8561 (31.01.2002 Gazette 2002/05)

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

20.07.2000 GB 0017690

(71)	Applicant: Weatherford/Lamb Inc.The United States Corporation Company
	Wilmington, DE 19805 (US)

(72)	Inventors:
	SIMPSON, Neil Andrew Abercombie PortlethanAberdeen AB12 4QX (GB) MACKAY, Alexander, Craig Aberdeen AB25 2UU (GB)

(74)	Representative: Harding, Richard Patrick
	Marks & Clerk,4220 Nash CourtOxford Business Park South Oxford OX4 2RU Oxford OX4 2RU (GB)

(54)	IMPROVEMENTS IN VALVES