- 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: 2846
10-year publication summary
|
208
|
163
|
157
|
206
|
247
|
180
|
147
|
162
|
138
|
36
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21247 |
519 |
| Schlumberger Technology Corporation | 11574 |
246 |
| Schlumberger Canada Limited | 7590 |
148 |
| Saudi Arabian Oil Company | 13953 |
139 |
| Services Petroliers Schlumberger | 5999 |
130 |
| Schlumberger Technology B.v. | 5285 |
119 |
| Weatherford Technology Holdings, LLC | 2073 |
93 |
| Baker Hughes Incorporated | 5026 |
62 |
| Prad Research and Development Limited | 2679 |
53 |
| Grant Prideco, Inc. | 433 |
48 |
| Schlumberger Holdings Limited | 2728 |
45 |
| National Oilwell Varco, L.P. | 1689 |
40 |
| Aramco Services Company | 4161 |
36 |
| Landmark Graphics Corporation | 1508 |
35 |
| Baker Hughes Oilfield Operations, LLC | 2478 |
35 |
| M-I L.L.C. | 766 |
27 |
| Nabors Drilling Technologies USA, Inc. | 575 |
27 |
| Enhanced Drilling AS | 43 |
23 |
| Chevron U.S.A. Inc. | 4109 |
19 |
| Pruitt Tool & Supply Co. | 73 |
19 |
| Other owners | 983 |