- 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: 575
10-year publication summary
|
33
|
28
|
35
|
35
|
38
|
32
|
26
|
22
|
13
|
15
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 21103 |
53 |
| Schlumberger Technology Corporation | 11089 |
28 |
| Baker Hughes Incorporated | 5168 |
24 |
| Frank's International, LLC | 240 |
17 |
| Schlumberger Canada Limited | 7446 |
15 |
| National Oilwell Varco, L.P. | 1703 |
15 |
| Schlumberger Technology B.v. | 5224 |
13 |
| Services Petroliers Schlumberger | 5888 |
13 |
| TT Technologies, Inc. | 151 |
13 |
| Itrec B.V. | 504 |
12 |
| Schlumberger Holdings Limited | 2780 |
9 |
| Prad Research and Development Limited | 2687 |
9 |
| Sandvik Intellectual Property AB | 1453 |
9 |
| Weatherford Technology Holdings, LLC | 2036 |
8 |
| Sandvik Mining and Construction Oy | 845 |
8 |
| Cameron International Corporation | 1355 |
7 |
| Saudi Arabian Oil Company | 13716 |
7 |
| Caterpillar Global Mining Equipment LLC | 169 |
6 |
| Frank's International, Inc. | 63 |
6 |
| Nabors Drilling Technologies USA, Inc. | 564 |
6 |
| Other owners | 297 |