- All sections
- E - Fixed constructions
- E21B - Earth or rock drilling; obtaining 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: 990
10-year publication summary
|
59
|
59
|
70
|
48
|
53
|
61
|
77
|
97
|
81
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20403 |
128 |
| Schlumberger Technology Corporation | 10217 |
87 |
| Schlumberger Canada Limited | 7137 |
77 |
| Saudi Arabian Oil Company | 12390 |
71 |
| Services Petroliers Schlumberger | 5616 |
65 |
| Schlumberger Technology B.v. | 5058 |
52 |
| Baker Hughes Incorporated | 5514 |
37 |
| Landmark Graphics Corporation | 1521 |
32 |
| Schlumberger Holdings Limited | 2870 |
24 |
| Prad Research and Development Limited | 2696 |
22 |
| Motive Drilling Technologies, Inc. | 97 |
17 |
| Geoquest Systems B.V. | 681 |
12 |
| Baker Hughes Oilfield Operations, LLC | 2105 |
12 |
| Weatherford Technology Holdings, LLC | 2107 |
11 |
| Chevron U.S.A. Inc. | 3844 |
10 |
| Magnetic Variation Services, LLC | 37 |
10 |
| Scientific Drilling International, Inc. | 164 |
10 |
| Baker Hughes, a GE Company, LLC | 2138 |
9 |
| Helmerich & Payne Technologies, LLC | 91 |
9 |
| Aramco Services Company | 3735 |
8 |
| Other owners | 287 |