- 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 43/00 - Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
Patent holdings for IPC class E21B 43/00
Total number of patents in this class: 2545
10-year publication summary
|
172
|
149
|
120
|
116
|
114
|
93
|
85
|
62
|
73
|
49
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 13349 |
152 |
| Halliburton Energy Services, Inc. | 20944 |
143 |
| Schlumberger Technology Corporation | 10868 |
132 |
| Schlumberger Canada Limited | 7363 |
97 |
| Baker Hughes Incorporated | 5251 |
85 |
| Services Petroliers Schlumberger | 5827 |
76 |
| ExxonMobil Upstream Research Company | 2395 |
73 |
| Aramco Services Company | 4023 |
69 |
| Landmark Graphics Corporation | 1523 |
66 |
| Chevron U.S.A. Inc. | 3984 |
61 |
| Schlumberger Technology B.v. | 5187 |
53 |
| Baker Hughes Holdings LLC | 3001 |
45 |
| Prad Research and Development Limited | 2692 |
42 |
| Schlumberger Holdings Limited | 2808 |
39 |
| ConocoPhillips Company | 1675 |
38 |
| Baker Hughes, a GE Company, LLC | 2111 |
25 |
| Harris Corporation | 1417 |
22 |
| Shell Internationale Research Maatschappij B.V. | 3553 |
21 |
| Geoquest Systems B.V. | 767 |
20 |
| M-I L.L.C. | 815 |
20 |
| Other owners | 1266 |