- 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 31/03 - Freeing by flushing
Patent holdings for IPC class E21B 31/03
Total number of patents in this class: 77
10-year publication summary
|
4
|
4
|
7
|
8
|
14
|
3
|
6
|
7
|
5
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 12947 |
21 |
| Aramco Services Company | 3929 |
8 |
| Halliburton Energy Services, Inc. | 20835 |
7 |
| National Oilwell Varco, L.P. | 1661 |
3 |
| Downhole Rental Tools, LLC | 14 |
3 |
| Schlumberger Technology Corporation | 10662 |
2 |
| Caterpillar Global Mining Equipment LLC | 155 |
2 |
| ConocoPhillips Company | 1677 |
2 |
| ExxonMobil Upstream Research Company | 2407 |
2 |
| Odfjell Well Services Norway AS | 19 |
2 |
| Hydra Well Intervention AS | 4 |
2 |
| Dorf Ketal Chemicals FZE | 52 |
2 |
| Horisont Energi AS | 33 |
2 |
| BP Corporation North America Inc. | 746 |
1 |
| China National Petroleum Corporation | 446 |
1 |
| Extreme Energy Solutions Inc. | 2 |
1 |
| Fluid Energy Group Ltd. | 56 |
1 |
| FMC Technologies, Inc. | 599 |
1 |
| Lamberti SpA | 254 |
1 |
| Mincon International Limited | 53 |
1 |
| Other owners | 12 |