- 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 43/16 - Enhanced recovery methods for obtaining hydrocarbons
Patent holdings for IPC class E21B 43/16
Total number of patents in this class: 3814
10-year publication summary
|
304
|
226
|
237
|
266
|
224
|
252
|
217
|
220
|
185
|
188
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21019 |
355 |
| Saudi Arabian Oil Company | 13540 |
347 |
| Schlumberger Technology Corporation | 10976 |
158 |
| Schlumberger Canada Limited | 7408 |
112 |
| Services Petroliers Schlumberger | 5857 |
91 |
| Chevron U.S.A. Inc. | 4011 |
83 |
| ConocoPhillips Company | 1682 |
81 |
| Schlumberger Technology B.v. | 5206 |
75 |
| Aramco Services Company | 4068 |
75 |
| ExxonMobil Upstream Research Company | 2384 |
70 |
| Baker Hughes Incorporated | 5230 |
57 |
| Shell Internationale Research Maatschappij B.V. | 3545 |
55 |
| Baker Hughes Holdings LLC | 3009 |
50 |
| Shell Oil Company | 2135 |
45 |
| Baker Hughes Oilfield Operations, LLC | 2368 |
45 |
| Prad Research and Development Limited | 2688 |
40 |
| Schlumberger Holdings Limited | 2795 |
39 |
| Landmark Graphics Corporation | 1524 |
38 |
| Cenovus Energy Inc. | 419 |
35 |
| S.p.c.m. SA | 239 |
30 |
| Other owners | 1933 |