- 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: 329
10-year publication summary
|
44
|
41
|
33
|
21
|
14
|
12
|
4
|
5
|
8
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Itrec B.V. | 504 |
48 |
| Noble Drilling A/S | 52 |
17 |
| Maersk Drilling A/S | 46 |
12 |
| Halliburton Energy Services, Inc. | 21305 |
8 |
| Daewoo Shipbuilding & Marine Engineering Co., Ltd. | 231 |
8 |
| Gustomsc Resources B.V. | 29 |
7 |
| National Oilwell Varco Norway AS | 107 |
7 |
| Transocean Sedco Forex Ventures Limited | 64 |
7 |
| Schlumberger Technology Corporation | 11839 |
6 |
| Horton Wison Deepwater, Inc. | 27 |
6 |
| Ensco International Incorporated | 56 |
5 |
| Helix Energy Solutions Group, Inc. | 28 |
5 |
| Gregg Drilling, LLC | 15 |
5 |
| Cameron International Corporation | 1370 |
4 |
| Mhwirth AS | 134 |
4 |
| Keppel Offshore & Marine Technology Centre Pte Ltd | 58 |
4 |
| Gustomsc B.V. | 37 |
4 |
| Schlumberger Canada Limited | 7609 |
3 |
| Schlumberger Technology B.v. | 5295 |
3 |
| Aker Solutions Inc. | 34 |
3 |
| Other owners | 163 |