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EP0157907
European procedure
Extract from the Register of European Patents
EP About this file: EP0157907
| EP0157907 - Drilling mud compositions [Right-click to bookmark this link] | |||
| Former [1985/42] | Drilling mud dispersants | ||
| [1988/10] | Status | No opposition filed within time limit Status updated on 10.01.1989 Database last updated on 11.04.2026 | Most recent event Tooltip | 25.07.2008 | Change - representative | published on 27.08.2008 [2008/35] | Applicant(s) | For all designated states National Starch and Chemical Corporation Box 6500 Bridgewater, N.J. 08807 / US | [1985/42] | Inventor(s) | 01 /
Gleason, Patricia A. 127 Washington Avenue Westfield New Jersey 07090 / US | 02 /
Brase, Ingrid E. 2 Hart Court East Windsor New Jersey 08520 / US | [1985/42] | Representative(s) | Hagemann, Heinrich, et al Meissner Bolte Patentanwälte Rechtsanwälte Partnerschaft mbB Widenmayerstrasse 47 80538 München / DE | [N/P] |
| Former [2008/35] | Hagemann, Heinrich, et al Meissner, Bolte & Partner Postfach 86 03 29 81630 München / DE | ||
| Former [1985/42] | Hagemann, Heinrich, Dr. rer. nat., Dipl.-Chem., et al Patentanwälte Hagemann & Kehl Postfach 86 03 29 D-81630 München / DE | Application number, filing date | 84113363.0 | 06.11.1984 | [1985/42] | Priority number, date | US19830558131 | 05.12.1983 Original published format: US 558131 | [1985/42] | Filing language | EN | Procedural language | EN | Publication | Type: | A2 Application without search report | No.: | EP0157907 | Date: | 16.10.1985 | Language: | EN | [1985/42] | Type: | A3 Search report | No.: | EP0157907 | Date: | 12.02.1986 | Language: | EN | [1986/07] | Type: | B1 Patent specification | No.: | EP0157907 | Date: | 09.03.1988 | Language: | EN | [1988/10] | Search report(s) | (Supplementary) European search report - dispatched on: | EP | 10.12.1985 | Classification | IPC: | C09K7/02 | [1985/42] | CPC: |
C09K8/24 (EP,US);
C08F8/44 (EP,US);
C08F2800/10 (EP,US)
| C-Set: |
C08F8/44, C08F8/36, C08F212/12 (EP,US);
C08F8/44, C08F8/36, C08F222/08 (US,EP) | Designated contracting states | AT, BE, DE, FR, IT, NL [1985/42] | Title | German: | Bohrflüssigkeiten | [1988/10] | English: | Drilling mud compositions | [1988/10] | French: | Fluides de forage | [1988/10] |
| Former [1985/42] | Dispergiermittel für Bohrflüssigkeiten | ||
| Former [1985/42] | Drilling mud dispersants | ||
| Former [1985/42] | Dispersants pour fluides de forage | Examination procedure | 06.11.1984 | Examination requested [1985/42] | 12.08.1986 | Despatch of a communication from the examining division (Time limit: M04) | 20.10.1986 | Reply to a communication from the examining division | 05.05.1987 | Despatch of communication of intention to grant (Approval: ) | 18.05.1987 | Communication of intention to grant the patent | 02.07.1987 | Fee for grant paid | 02.07.1987 | Fee for publishing/printing paid | Opposition(s) | 12.12.1988 | No opposition filed within time limit [1989/09] | Fees paid | Renewal fee | 13.11.1986 | Renewal fee patent year 03 | 16.11.1987 | Renewal fee patent year 04 |
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