- 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 37/02 - Scrapers specially adapted therefor
Patent holdings for IPC class E21B 37/02
Total number of patents in this class: 279
10-year publication summary
|
30
|
17
|
14
|
21
|
23
|
21
|
18
|
21
|
16
|
9
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20901 |
33 |
| Saudi Arabian Oil Company | 13185 |
26 |
| Baker Hughes Holdings LLC | 3006 |
14 |
| Baker Hughes Incorporated | 5241 |
11 |
| Odfjell Well Services Norway AS | 19 |
8 |
| Qinterra Technologies AS | 38 |
8 |
| Welltec AS | 297 |
8 |
| Baker Hughes Oilfield Operations, LLC | 2305 |
8 |
| Schlumberger Canada Limited | 7296 |
5 |
| Schlumberger Technology B.v. | 5165 |
5 |
| Weatherford Technology Holdings, LLC | 2023 |
5 |
| Services Petroliers Schlumberger | 5787 |
5 |
| Schlumberger Technology Corporation | 10727 |
4 |
| Schlumberger Holdings Limited | 2822 |
4 |
| Aramco Services Company | 3976 |
4 |
| China National Petroleum Corporation | 448 |
4 |
| ConocoPhillips Company | 1673 |
4 |
| Prad Research and Development Limited | 2693 |
4 |
| Downhole Rental Tools, LLC | 14 |
4 |
| Aarbakke Innovation A.S. | 29 |
3 |
| Other owners | 112 |