- 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 37/04 - Scrapers specially adapted therefor operated by fluid pressure, e.g. free-piston scrapers
Patent holdings for IPC class E21B 37/04
Total number of patents in this class: 92
10-year publication summary
|
2
|
6
|
8
|
6
|
8
|
16
|
13
|
7
|
3
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Baker Hughes Oilfield Operations, LLC | 2320 |
9 |
| Halliburton Energy Services, Inc. | 20944 |
8 |
| Saudi Arabian Oil Company | 13349 |
5 |
| Schlumberger Technology Corporation | 10868 |
4 |
| Schlumberger Canada Limited | 7363 |
3 |
| Schlumberger Technology B.v. | 5187 |
3 |
| Weatherford Technology Holdings, LLC | 2029 |
3 |
| ConocoPhillips Company | 1675 |
3 |
| Services Petroliers Schlumberger | 5827 |
3 |
| Tri-State Environmental, LLC | 18 |
3 |
| Coretrax Global Limited | 37 |
3 |
| Odfjell Technology Invest Ltd | 11 |
3 |
| Shell Internationale Research Maatschappij B.V. | 3553 |
2 |
| Shell Oil Company | 2138 |
2 |
| Aramco Services Company | 4023 |
2 |
| Paradigm Flow Services Limited | 30 |
2 |
| Pipetech International AS | 4 |
2 |
| Odfjell Partners Invest Ltd | 4 |
2 |
| Downhole Rental Tools, LLC | 14 |
2 |
| Altus Intervention (technologies) AS | 66 |
2 |
| Other owners | 26 |