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EP0538989
European procedure
Extract from the Register of European Patents
EP About this file: EP0538989
| EP0538989 - Well cement compositions and their use [Right-click to bookmark this link] | Status | No opposition filed within time limit Status updated on 04.04.1997 Database last updated on 03.09.2024 | Most recent event Tooltip | 04.05.2012 | Lapse of the patent in a contracting state | published on 06.06.2012 [2012/23] | Applicant(s) | For all designated states HALLIBURTON COMPANY P.O. Drawer 1431 Duncan Oklahoma 73536 / US | [N/P] |
| Former [1993/17] | For all designated states HALLIBURTON COMPANY P.O. Drawer 1431 Duncan Oklahoma 73536 / US | Inventor(s) | 01 /
Olaussen, Stein Tasabekken 20 N-4046 Hafrsfjord / NO | 02 /
Bjordal, Audun Liljevaenget 20 DK-6710 Esbjerg / DK | 03 /
Solland, Geir Kari Trestakkvei 11A N-4300 Sandnes / NO | [1993/17] | Representative(s) | Wain, Christopher Paul, et al A.A. Thornton & Co. 235 High Holborn London WC1V 7LE / GB | [N/P] |
| Former [1993/17] | Wain, Christopher Paul, et al A.A. THORNTON & CO. Northumberland House 303-306 High Holborn London WC1V 7LE / GB | Application number, filing date | 92306392.9 | 13.07.1992 | [1993/17] | Priority number, date | US19910779673 | 21.10.1991 Original published format: US 779673 | [1993/17] | Filing language | EN | Procedural language | EN | Publication | Type: | A2 Application without search report | No.: | EP0538989 | Date: | 28.04.1993 | Language: | EN | [1993/17] | Type: | A3 Search report | No.: | EP0538989 | Date: | 02.06.1993 | Language: | EN | [1993/22] | Type: | B1 Patent specification | No.: | EP0538989 | Date: | 22.05.1996 | Language: | EN | [1996/21] | Search report(s) | (Supplementary) European search report - dispatched on: | EP | 16.04.1993 | Classification | IPC: | E21B33/13, C04B28/24, C04B14/06 | [1993/22] | CPC: |
C04B14/062 (EP,US);
C04B28/04 (EP,US);
C09K8/46 (EP,US);
C04B2111/00146 (EP,US)
| C-Set: |
C04B28/04, C04B14/062, C04B2103/22, C04B2103/46 (EP,US);
C04B28/04, C04B14/062, C04B24/16, C04B24/18 (US,EP) |
| Former IPC [1993/17] | E21B33/13, C04B28/02 | Designated contracting states | DE, DK, FR, GB, IT, NL [1993/17] | Title | German: | Bohrloch-Zementierungszusammensetzungen und ihre Verwendung | [1993/17] | English: | Well cement compositions and their use | [1993/17] | French: | Compositions de cimentation de puits et leurs utilisation | [1993/17] | Examination procedure | 01.09.1993 | Examination requested [1993/43] | 14.12.1993 | Despatch of a communication from the examining division (Time limit: M06) | 27.06.1994 | Reply to a communication from the examining division | 30.12.1994 | Despatch of a communication from the examining division (Time limit: M04) | 05.05.1995 | Reply to a communication from the examining division | 13.07.1995 | Despatch of communication of intention to grant (Approval: Yes) | 20.11.1995 | Communication of intention to grant the patent | 22.01.1996 | Fee for grant paid | 22.01.1996 | Fee for publishing/printing paid | Opposition(s) | 25.02.1997 | No opposition filed within time limit [1997/21] | Fees paid | Renewal fee | 07.07.1994 | Renewal fee patent year 03 | 11.07.1995 | Renewal fee patent year 04 |
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| Responsibility for the accuracy, completeness or quality of the data displayed under the link provided lies entirely with the Unified Patent Court. | Lapses during opposition Tooltip | DK | 22.05.1996 | [2012/23] |
| Former [1998/15] | DK | 22.05.1996 | Documents cited: | Search | [A]BE331436 ; | [Y]US4482381 (SPITZ RODNEY D [US], et al); | [Y]EP0314242 (PUMPTECH NV [BE]); | [Y]WO9011977 (NORSKE STATS OLJESELSKAP [NO]) | Examination | - Kirk Othmer, 3 ed. vol. 20, p. 766-768 & 771 |