- 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: 2753
10-year publication summary
|
256
|
208
|
163
|
157
|
206
|
243
|
178
|
143
|
151
|
82
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20908 |
511 |
| Schlumberger Technology Corporation | 10745 |
225 |
| Schlumberger Canada Limited | 7298 |
144 |
| Saudi Arabian Oil Company | 13206 |
134 |
| Services Petroliers Schlumberger | 5788 |
128 |
| Schlumberger Technology B.v. | 5163 |
117 |
| Weatherford Technology Holdings, LLC | 2024 |
89 |
| Baker Hughes Incorporated | 5238 |
64 |
| Prad Research and Development Limited | 2693 |
53 |
| Grant Prideco, Inc. | 386 |
47 |
| Schlumberger Holdings Limited | 2819 |
46 |
| National Oilwell Varco, L.P. | 1669 |
39 |
| Aramco Services Company | 3981 |
35 |
| Landmark Graphics Corporation | 1525 |
33 |
| Baker Hughes Oilfield Operations, LLC | 2313 |
33 |
| Nabors Drilling Technologies USA, Inc. | 556 |
27 |
| M-I L.L.C. | 808 |
26 |
| Enhanced Drilling AS | 42 |
22 |
| Baker Hughes, a GE Company, LLC | 2112 |
19 |
| Chevron U.S.A. Inc. | 3966 |
18 |
| Other owners | 943 |