- 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: 916
10-year publication summary
57
|
59
|
59
|
70
|
48
|
53
|
60
|
75
|
92
|
33
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Halliburton Energy Services, Inc. | 20165 |
116 |
Schlumberger Technology Corporation | 9690 |
76 |
Schlumberger Canada Limited | 6913 |
69 |
Saudi Arabian Oil Company | 11322 |
63 |
Services Petroliers Schlumberger | 5426 |
59 |
Schlumberger Technology B.v. | 4951 |
46 |
Baker Hughes Incorporated | 5689 |
37 |
Landmark Graphics Corporation | 1526 |
32 |
Schlumberger Holdings Limited | 2947 |
24 |
Prad Research and Development Limited | 2696 |
22 |
Motive Drilling Technologies, Inc. | 89 |
16 |
Geoquest Systems B.V. | 584 |
12 |
Baker Hughes Oilfield Operations, LLC | 1885 |
12 |
Weatherford Technology Holdings, LLC | 2135 |
11 |
Chevron U.S.A. Inc. | 3774 |
10 |
Scientific Drilling International, Inc. | 161 |
10 |
Magnetic Variation Services, LLC | 34 |
9 |
Baker Hughes, a GE Company, LLC | 2171 |
9 |
Aramco Services Company | 3504 |
8 |
ExxonMobil Upstream Research Company | 2525 |
7 |
Other owners | 268 |