- 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 33/138 - Plastering the borehole wallInjecting into the formation
Patent holdings for IPC class E21B 33/138
Total number of patents in this class: 1368
10-year publication summary
|
142
|
140
|
122
|
168
|
135
|
129
|
63
|
78
|
44
|
40
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 12858 |
260 |
| Halliburton Energy Services, Inc. | 20749 |
256 |
| Schlumberger Technology Corporation | 10627 |
88 |
| Thru Tubing Solutions, Inc. | 375 |
37 |
| Aramco Services Company | 3910 |
36 |
| Schlumberger Canada Limited | 7235 |
34 |
| Schlumberger Technology B.v. | 5148 |
27 |
| Services Petroliers Schlumberger | 5756 |
26 |
| Baker Hughes Holdings LLC | 3007 |
20 |
| M-I L.L.C. | 815 |
17 |
| Baker Hughes Incorporated | 5289 |
16 |
| ExxonMobil Upstream Research Company | 2411 |
16 |
| Bisn Tec Ltd | 79 |
15 |
| ConocoPhillips Company | 1676 |
15 |
| Schlumberger Holdings Limited | 2841 |
13 |
| Prad Research and Development Limited | 2694 |
13 |
| Eavor Technologies Inc. | 91 |
13 |
| Chevron U.S.A. Inc. | 3929 |
11 |
| University of Kansas | 867 |
10 |
| Baker Hughes Oilfield Operations, LLC | 2269 |
10 |
| Other owners | 435 |