- 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: 594
10-year publication summary
|
47
|
65
|
46
|
37
|
40
|
34
|
43
|
38
|
25
|
14
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20924 |
90 |
| Saudi Arabian Oil Company | 13263 |
25 |
| Schlumberger Technology Corporation | 10802 |
24 |
| National Oilwell Varco, L.P. | 1683 |
23 |
| M-I L.L.C. | 815 |
19 |
| Schlumberger Canada Limited | 7343 |
16 |
| Schlumberger Technology B.v. | 5182 |
15 |
| Services Petroliers Schlumberger | 5811 |
15 |
| Nabors Drilling Technologies USA, Inc. | 561 |
11 |
| Baker Hughes Incorporated | 5265 |
9 |
| Weatherford Technology Holdings, LLC | 2027 |
8 |
| Performance Pulsation Control, Inc. | 58 |
8 |
| Schlumberger Holdings Limited | 2816 |
7 |
| Aramco Services Company | 3993 |
7 |
| Katch Kan Holdings Ltd. | 55 |
7 |
| Prad Research and Development Limited | 2693 |
7 |
| Recover Energy Services Inc. | 51 |
7 |
| Shell USA, Inc. | 1227 |
5 |
| Covar Applied Technologies, Inc. | 11 |
4 |
| ExxonMobil Upstream Research Company | 2395 |
4 |
| Other owners | 283 |