- All sections
- E - Fixed constructions
- E21B - Earth or rock drilling; obtaining 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: 2573
10-year publication summary
|
252
|
256
|
208
|
163
|
157
|
205
|
244
|
177
|
133
|
41
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20165 |
490 |
| Schlumberger Technology Corporation | 9690 |
186 |
| Schlumberger Canada Limited | 6913 |
131 |
| Services Petroliers Schlumberger | 5426 |
116 |
| Saudi Arabian Oil Company | 11322 |
110 |
| Schlumberger Technology B.v. | 4951 |
108 |
| Weatherford Technology Holdings, LLC | 2135 |
87 |
| Baker Hughes Incorporated | 5689 |
71 |
| Prad Research and Development Limited | 2696 |
53 |
| Grant Prideco, Inc. | 384 |
50 |
| Schlumberger Holdings Limited | 2947 |
46 |
| National Oilwell Varco, L.P. | 1604 |
34 |
| Landmark Graphics Corporation | 1526 |
32 |
| Aramco Services Company | 3504 |
31 |
| Baker Hughes Oilfield Operations, LLC | 1885 |
28 |
| M-I L.L.C. | 893 |
27 |
| Nabors Drilling Technologies USA, Inc. | 533 |
25 |
| Smith International, Inc. | 761 |
20 |
| Baker Hughes, a GE Company, LLC | 2171 |
19 |
| Enhanced Drilling AS | 36 |
18 |
| Other owners | 891 |