- 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 43/04 - Gravelling of wells
Patent holdings for IPC class E21B 43/04
Total number of patents in this class: 1190
10-year publication summary
|
95
|
94
|
94
|
65
|
43
|
61
|
41
|
25
|
21
|
11
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20835 |
308 |
| Schlumberger Technology Corporation | 10662 |
123 |
| Baker Hughes Incorporated | 5277 |
97 |
| Schlumberger Canada Limited | 7273 |
70 |
| Schlumberger Technology B.v. | 5161 |
65 |
| Services Petroliers Schlumberger | 5772 |
65 |
| Weatherford Technology Holdings, LLC | 2015 |
44 |
| Schlumberger Holdings Limited | 2835 |
43 |
| Prad Research and Development Limited | 2693 |
39 |
| ExxonMobil Upstream Research Company | 2407 |
37 |
| Baker Hughes Oilfield Operations, LLC | 2288 |
22 |
| Baker Hughes Holdings LLC | 3005 |
22 |
| Baker Hughes, a GE Company, LLC | 2114 |
21 |
| M-I L.L.C. | 813 |
16 |
| CARBO Ceramics Inc. | 237 |
15 |
| Saudi Arabian Oil Company | 12947 |
15 |
| CURTIS, Philip, Anthony | 436 |
14 |
| Weatherford U.K. Limited | 71 |
8 |
| BP Corporation North America Inc. | 746 |
7 |
| Weatherford / Lamb, Inc. | 153 |
7 |
| Other owners | 152 |