- All sections
- E - Fixed constructions
- E21B - Earth or rock drillingobtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 7/128 - Underwater drilling from floating support with independent underwater anchored guide base
Patent holdings for IPC class E21B 7/128
Total number of patents in this class: 108
10-year publication summary
|
11
|
12
|
10
|
10
|
8
|
5
|
5
|
2
|
4
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Itrec B.V. | 504 |
13 |
| Schlumberger Technology Corporation | 10745 |
4 |
| Halliburton Energy Services, Inc. | 20908 |
3 |
| Enhanced Drilling AS | 42 |
3 |
| Vetco Gray Scandinavia AS | 172 |
3 |
| Noble Drilling A/S | 49 |
3 |
| Shell Internationale Research Maatschappij B.V. | 3539 |
2 |
| Shell Oil Company | 2139 |
2 |
| AGR Subsea AS | 20 |
2 |
| Bauer Spezialtiefbau GmbH | 112 |
2 |
| China University of Petroleum (East China) | 377 |
2 |
| Drillmec SpA | 39 |
2 |
| Gordon Technologies, LLC. | 23 |
2 |
| Grant Prideco, Inc. | 386 |
2 |
| Hydril USA Distribution LLC | 213 |
2 |
| Kvaerner AS | 8 |
2 |
| Nautilus Minerals Pacific Pty Ltd | 26 |
2 |
| Noble Drilling Services, Inc. | 17 |
2 |
| Ocean Riser Systems AS | 4 |
2 |
| Saipem S.p.A. | 514 |
2 |
| Other owners | 51 |