- 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 4/16 - Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units
Patent holdings for IPC class E21B 4/16
Total number of patents in this class: 125
10-year publication summary
|
6
|
18
|
9
|
8
|
8
|
8
|
17
|
8
|
11
|
2
|
| 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 |
11 |
| China Petroleum & Chemical Corporation | 1623 |
10 |
| Flexidrill Limited | 53 |
6 |
| Lkab Wassara AB | 44 |
6 |
| Sinopec Petroleum Engineering Technology Research Institute Co., Ltd. | 27 |
6 |
| Saudi Arabian Oil Company | 11322 |
4 |
| Sinopec Research Institute of Petroleum Engineering | 25 |
4 |
| Schlumberger Canada Limited | 6913 |
3 |
| Fishbones AS | 8 |
3 |
| Thru Tubing Solutions, Inc. | 361 |
3 |
| EarthGrid PBC | 21 |
3 |
| Schlumberger Technology Corporation | 9690 |
2 |
| Schlumberger Technology B.v. | 4951 |
2 |
| Schlumberger Holdings Limited | 2947 |
2 |
| JFK Equipment Limited | 7 |
2 |
| Lewal Drilling Ltd. | 3 |
2 |
| Prad Research and Development Limited | 2696 |
2 |
| Services Petroliers Schlumberger | 5426 |
2 |
| SJM Designs Pty Ltd. | 3 |
2 |
| Southwest Petroleum University | 403 |
2 |
| Other owners | 48 |