- 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 43/04 - Gravelling of wells
Patent holdings for IPC class E21B 43/04
Total number of patents in this class: 1214
10-year publication summary
87
|
95
|
94
|
94
|
65
|
43
|
60
|
41
|
22
|
10
|
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 |
323 |
Schlumberger Technology Corporation | 9690 |
123 |
Baker Hughes Incorporated | 5689 |
105 |
Schlumberger Canada Limited | 6913 |
70 |
Schlumberger Technology B.v. | 4951 |
65 |
Services Petroliers Schlumberger | 5426 |
65 |
Weatherford Technology Holdings, LLC | 2135 |
46 |
Schlumberger Holdings Limited | 2947 |
44 |
Prad Research and Development Limited | 2696 |
39 |
ExxonMobil Upstream Research Company | 2525 |
38 |
Baker Hughes Holdings LLC | 3060 |
25 |
Baker Hughes Oilfield Operations, LLC | 1885 |
22 |
Baker Hughes, a GE Company, LLC | 2171 |
21 |
CURTIS, Philip, Anthony | 497 |
17 |
M-I L.L.C. | 893 |
16 |
Saudi Arabian Oil Company | 11322 |
14 |
CARBO Ceramics Inc. | 248 |
13 |
BP Corporation North America Inc. | 776 |
7 |
Weatherford U.K. Limited | 73 |
7 |
Weatherford / Lamb, Inc. | 158 |
7 |
Other owners | 147 |