- 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 21/01 - Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
Patent holdings for IPC class E21B 21/01
Total number of patents in this class: 596
10-year publication summary
|
76
|
52
|
38
|
47
|
37
|
44
|
42
|
26
|
22
|
15
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21296 |
92 |
| Saudi Arabian Oil Company | 14329 |
27 |
| Schlumberger Technology Corporation | 11893 |
26 |
| National Oilwell Varco, L.P. | 1700 |
23 |
| M-I L.L.C. | 737 |
17 |
| Schlumberger Canada Limited | 7627 |
16 |
| Schlumberger Technology B.v. | 5302 |
14 |
| Services Petroliers Schlumberger | 6038 |
14 |
| Nabors Drilling Technologies USA, Inc. | 576 |
11 |
| Baker Hughes Incorporated | 4903 |
8 |
| Weatherford Technology Holdings, LLC | 2161 |
8 |
| Performance Pulsation Control, Inc. | 62 |
8 |
| Aramco Services Company | 4192 |
7 |
| Katch Kan Holdings Ltd. | 54 |
7 |
| Recover Energy Services Inc. | 51 |
7 |
| Schlumberger Holdings Limited | 2683 |
6 |
| Prad Research and Development Limited | 2652 |
6 |
| Shell USA, Inc. | 1341 |
5 |
| Covar Applied Technologies, Inc. | 11 |
4 |
| Grant Prideco, Inc. | 447 |
4 |
| Other owners | 286 |