- All sections
- E - Fixed constructions
- E21B - Earth or rock drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 19/09 - Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus 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: 195
10-year publication summary
|
22
|
26
|
28
|
21
|
11
|
13
|
11
|
6
|
3
|
1
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Itrec B.V. | 477 |
33 |
| Mhwirth AS | 113 |
10 |
| Halliburton Energy Services, Inc. | 20165 |
7 |
| Castor Drilling Solution AS | 7 |
7 |
| IFP Energies Nouvelles | 2717 |
7 |
| Schlumberger Canada Limited | 6913 |
4 |
| Weatherford Technology Holdings, LLC | 2135 |
4 |
| Cameron International Corporation | 1305 |
4 |
| Ensco International Incorporated | 57 |
4 |
| Grant Prideco, Inc. | 384 |
4 |
| Noble Drilling A/S | 49 |
4 |
| Schlumberger Technology B.v. | 4951 |
3 |
| Schlumberger Holdings Limited | 2947 |
3 |
| Smith International, Inc. | 761 |
3 |
| Cameron Sense AS | 3 |
3 |
| Depro AS | 10 |
3 |
| Dril-Quip, Inc. | 155 |
3 |
| Electrical Subsea & Drilling AS | 41 |
3 |
| Nabors Drilling Technologies USA, Inc. | 533 |
3 |
| National Oilwell Varco, L.P. | 1604 |
3 |
| Other owners | 80 |