- 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 47/04 - Measuring depth or liquid level
Patent holdings for IPC class E21B 47/04
Total number of patents in this class: 1147
10-year publication summary
|
59
|
71
|
48
|
54
|
62
|
78
|
104
|
88
|
82
|
39
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21305 |
148 |
| Schlumberger Technology Corporation | 11839 |
120 |
| Schlumberger Canada Limited | 7609 |
96 |
| Services Petroliers Schlumberger | 6028 |
80 |
| Saudi Arabian Oil Company | 14275 |
77 |
| Schlumberger Technology B.v. | 5295 |
63 |
| Baker Hughes Incorporated | 4922 |
36 |
| Landmark Graphics Corporation | 1505 |
36 |
| Prad Research and Development Limited | 2655 |
22 |
| Schlumberger Holdings Limited | 2690 |
21 |
| Motive Drilling Technologies, Inc. | 104 |
20 |
| Geoquest Systems B.V. | 879 |
16 |
| Baker Hughes Oilfield Operations, LLC | 2534 |
15 |
| Chevron U.S.A. Inc. | 4145 |
14 |
| Aramco Services Company | 4194 |
11 |
| Magnetic Variation Services, LLC | 40 |
11 |
| Weatherford Technology Holdings, LLC | 2160 |
10 |
| Scientific Drilling International, Inc. | 172 |
9 |
| Baker Hughes, a GE Company, LLC | 2051 |
9 |
| Helmerich & Payne Technologies, LLC | 114 |
9 |
| Other owners | 324 |