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Bibliographic data

Indications of the International Patent Classification (IPC)
(51)	INT.CL.: (2006.01)	E21B 33/138

Patent
(11)	Number of the document	2631
(13)	Kind of document	B
(21)	Application number	RP1133
(22)	Date of filing the application	1993-09-27
(41)	Date of publication of the application
(45)	Date of publication of patent	1994-04-25

PCT application
(86)	Number	1762765
	Date	1989-05-26

Priority applications
(30)	Number	Date	Country code
	63-128186	1988-05-27	JP

Applicant
(71)	TOHO KAGAKU KOGYO CO.,LTD, Ochanomizu Square Bldg., 1-6, Kandasurugadai, Chioda-ku, Tokyo, JP

Inventors
(72)	Takeshi HIHARA, JP Masahide YANAGIA, JP Kazuhito ONO, JP

Grantee
(73)	TOHO KAGAKU KOGYO CO.,LTD., Ochanomizu Square Bldg., 1-6, Kandasurugadai, Chioda-ku, Tokyo, JP

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
	1998-09-21	8	800.00 LTL

Legal status
	Patent lapsed (non-payment of fees)
	Invalidation date	1999-09-27