- 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 19/09 - Apparatus for feeding the rods or cablesApparatus for increasing or decreasing the pressure on the drilling toolApparatus for counterbalancing the weight of the rods specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string
Patent holdings for IPC class E21B 19/09
Total number of patents in this class: 198
10-year publication summary
|
23
|
25
|
20
|
11
|
11
|
11
|
5
|
2
|
7
|
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 |
31 |
| Mhwirth AS | 131 |
11 |
| Halliburton Energy Services, Inc. | 21090 |
7 |
| Castor Drilling Solution AS | 7 |
7 |
| IFP Energies Nouvelles | 2983 |
7 |
| Schlumberger Canada Limited | 7440 |
4 |
| Cameron International Corporation | 1353 |
4 |
| Ensco International Incorporated | 54 |
4 |
| Grant Prideco, Inc. | 399 |
4 |
| Noble Drilling A/S | 51 |
4 |
| Schlumberger Technology Corporation | 11075 |
3 |
| Schlumberger Technology B.v. | 5224 |
3 |
| Schlumberger Holdings Limited | 2784 |
3 |
| Weatherford Technology Holdings, LLC | 2034 |
3 |
| Smith International, Inc. | 714 |
3 |
| Cameron Sense AS | 3 |
3 |
| Depro AS | 10 |
3 |
| Electrical Subsea & Drilling AS | 44 |
3 |
| Nabors Drilling Technologies USA, Inc. | 564 |
3 |
| National Oilwell Varco, L.P. | 1701 |
3 |
| Other owners | 85 |