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Bibliographic data

Indications of the International Patent Classification (IPC)
(51)	INT.CL.: (2006.01)	E01B 9/00

Patent
(11)	Number of the document	2535
(13)	Kind of document	B
(21)	Application number	RP1207
(22)	Date of filing the application	1993-09-28
(41)	Date of publication of the application
(45)	Date of publication of patent	1994-02-15

PCT application
(86)	Number	1074412
	Date	1981-04-27

Priority applications
(30)	Number	Date	Country code
	7906455	1979-08-28	NL
	PCT/NL80/00028	1980-08-28	WO

Applicant
(71)	Everts en van der Weyden Exploitatie Maatschappij EWEM B.V., Nassauplein 25, 2585 EC Den Haag, NL

Inventors
(72)	Marius Hendrik LUBBERS, NL

Grantee
(73)	Everts en van der Weyden Exploitatie Maatschappij EWEM B.V., Nassauplein 25, 2585 EC Den Haag, NL

Attorney or representative
(74)	Reda ŽABOLIENĖ, METIDA, Verslo centras "VERTAS", Gynėjų g. 16, LT-01109 Vilnius, LT

Title
(54)

Last renewal fee
	Payment date	Validity (years)	Amount
	1994-08-30	4	250.00 USD

Next renewal fee
	1997-09-28

Legal status
	Patent expired
	Invalidation date	1995-08-28