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Legal status
Patent lapsed (non-payment of fees)
| (51) | INT.CL.: (2006.01) |
E21B 37/00 E21B 41/00 |
| (11) | Number of the document | 4330 |
| (13) | Kind of document | B |
| (21) | Application number | 97-142 |
| (22) | Date of filing the application | 1997-08-18 |
| (41) | Date of publication of the application | 1998-02-25 |
| (45) | Date of publication of patent | 1998-04-27 |
| (86) | Number | PCT/GB96/00045 |
| Date | 1996-01-11 |
| (87) | Number | WO 96/22451 |
| Date | 1996-07-25 |
| (30) | Number | Date | Country code |
| 9501021.1 | 1995-01-19 | GB | |
| 9511487.2 | 1995-06-07 | GB |
| (71) |
BP CHEMICALS LIMITED,
Britannic House, 1 Finsbury Circus, London EC2M 7BA,
GB
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| (72) |
Richard George CHAPMAN, GB
Ian Ralph COLLINS, GB Stephen Paul GOODWIN, GB Andrew Richard LUCY, GB Newin John STEWART, GB |
| (73) |
BP CHEMICALS LIMITED,
Britannic House, 1 Finsbury Circus, London EC2M 7BA,
GB
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| (74) |
Liudmila GERASIMOVIČ,
IĮ "Liudmila Gerasimovič, Patentinis patikėtinis", Vingrių g. 13-42, LT-01141 Vilnius,
LT
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| (54) | OIL AND GAS FIELD CHEMICALS |
| Payment date | Validity (years) | Amount | |
| 2008-12-18 | 14 | 1000.00 LTL |
| Patent lapsed (non-payment of fees) | ||
| Invalidation date | 2010-01-11 |