- 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: 3733
10-year publication summary
|
355
|
274
|
274
|
320
|
259
|
286
|
235
|
243
|
187
|
133
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20879 |
350 |
| Saudi Arabian Oil Company | 13091 |
329 |
| Schlumberger Technology Corporation | 10705 |
153 |
| Schlumberger Canada Limited | 7293 |
110 |
| Services Petroliers Schlumberger | 5784 |
89 |
| Chevron U.S.A. Inc. | 3953 |
81 |
| ConocoPhillips Company | 1673 |
79 |
| Schlumberger Technology B.v. | 5166 |
73 |
| Aramco Services Company | 3955 |
72 |
| ExxonMobil Upstream Research Company | 2403 |
71 |
| Shell Internationale Research Maatschappij B.V. | 3542 |
57 |
| Baker Hughes Incorporated | 5252 |
54 |
| Baker Hughes Holdings LLC | 3007 |
50 |
| Shell Oil Company | 2141 |
45 |
| Baker Hughes Oilfield Operations, LLC | 2297 |
42 |
| Prad Research and Development Limited | 2693 |
40 |
| Schlumberger Holdings Limited | 2831 |
39 |
| Landmark Graphics Corporation | 1526 |
38 |
| Cenovus Energy Inc. | 420 |
33 |
| S.p.c.m. SA | 240 |
30 |
| Other owners | 1898 |