- 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 21/08 - Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
Patent holdings for IPC class E21B 21/08
Total number of patents in this class: 2780
10-year publication summary
|
202
|
180
|
143
|
142
|
185
|
218
|
156
|
135
|
146
|
102
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20991 |
514 |
| Schlumberger Technology Corporation | 10930 |
227 |
| Schlumberger Canada Limited | 7383 |
144 |
| Saudi Arabian Oil Company | 13442 |
137 |
| Services Petroliers Schlumberger | 5838 |
128 |
| Schlumberger Technology B.v. | 5191 |
117 |
| Weatherford Technology Holdings, LLC | 2035 |
91 |
| Baker Hughes Incorporated | 5238 |
64 |
| Prad Research and Development Limited | 2690 |
53 |
| Grant Prideco, Inc. | 393 |
47 |
| Schlumberger Holdings Limited | 2800 |
46 |
| National Oilwell Varco, L.P. | 1690 |
39 |
| Aramco Services Company | 4042 |
36 |
| Landmark Graphics Corporation | 1524 |
34 |
| Baker Hughes Oilfield Operations, LLC | 2344 |
34 |
| M-I L.L.C. | 809 |
27 |
| Nabors Drilling Technologies USA, Inc. | 562 |
27 |
| Enhanced Drilling AS | 42 |
22 |
| Baker Hughes, a GE Company, LLC | 2109 |
19 |
| Chevron U.S.A. Inc. | 4010 |
18 |
| Other owners | 956 |