- 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 19/24 - Guiding or centralising devices for drilling rods or pipes
Patent holdings for IPC class E21B 19/24
Total number of patents in this class: 592
10-year publication summary
|
32
|
37
|
41
|
43
|
36
|
31
|
25
|
14
|
22
|
18
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21257 |
53 |
| Schlumberger Technology Corporation | 11584 |
30 |
| Baker Hughes Incorporated | 5018 |
24 |
| Frank's International, LLC | 239 |
18 |
| Schlumberger Canada Limited | 7588 |
16 |
| National Oilwell Varco, L.P. | 1690 |
16 |
| Schlumberger Technology B.v. | 5282 |
14 |
| Services Petroliers Schlumberger | 5996 |
14 |
| TT Technologies, Inc. | 152 |
13 |
| Itrec B.V. | 505 |
12 |
| Schlumberger Holdings Limited | 2724 |
9 |
| Prad Research and Development Limited | 2678 |
9 |
| Weatherford Technology Holdings, LLC | 2072 |
8 |
| Sandvik Mining and Construction Oy | 875 |
8 |
| Cameron International Corporation | 1367 |
7 |
| Sandvik Intellectual Property AB | 1412 |
7 |
| Saudi Arabian Oil Company | 13956 |
7 |
| Caterpillar Global Mining Equipment LLC | 174 |
6 |
| Frank's International, Inc. | 61 |
6 |
| Nabors Drilling Technologies USA, Inc. | 575 |
6 |
| Other owners | 309 |