- 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 15/02 - Supports for the drilling machine, e.g. derricks or masts specially adapted for underwater drilling
Patent holdings for IPC class E21B 15/02
Total number of patents in this class: 336
10-year publication summary
|
46
|
44
|
41
|
33
|
21
|
14
|
12
|
4
|
5
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Itrec B.V. | 503 |
48 |
| Noble Drilling A/S | 49 |
17 |
| Maersk Drilling A/S | 47 |
12 |
| Halliburton Energy Services, Inc. | 20891 |
8 |
| Daewoo Shipbuilding & Marine Engineering Co., Ltd. | 233 |
8 |
| Gustomsc Resources B.V. | 30 |
7 |
| National Oilwell Varco Norway AS | 107 |
7 |
| Transocean Sedco Forex Ventures Limited | 61 |
7 |
| Schlumberger Technology Corporation | 10717 |
6 |
| Horton Wison Deepwater, Inc. | 28 |
6 |
| Seabed Rig AS | 13 |
6 |
| Ensco International Incorporated | 54 |
5 |
| Helix Energy Solutions Group, Inc. | 28 |
5 |
| Cameron International Corporation | 1332 |
4 |
| Mhwirth AS | 129 |
4 |
| Noble Drilling Services, Inc. | 17 |
4 |
| Keppel Offshore & Marine Technology Centre Pte Ltd | 59 |
4 |
| Gregg Drilling, LLC | 11 |
4 |
| Gustomsc B.V. | 30 |
4 |
| Schlumberger Canada Limited | 7296 |
3 |
| Other owners | 167 |