- 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: 573
10-year publication summary
|
33
|
28
|
35
|
35
|
38
|
31
|
26
|
22
|
13
|
11
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20924 |
53 |
| Schlumberger Technology Corporation | 10802 |
28 |
| Baker Hughes Incorporated | 5265 |
24 |
| Frank's International, LLC | 240 |
17 |
| Schlumberger Canada Limited | 7343 |
15 |
| National Oilwell Varco, L.P. | 1683 |
15 |
| Schlumberger Technology B.v. | 5182 |
13 |
| Services Petroliers Schlumberger | 5811 |
13 |
| Itrec B.V. | 503 |
12 |
| Sandvik Intellectual Property AB | 1481 |
11 |
| TT Technologies, Inc. | 151 |
11 |
| Schlumberger Holdings Limited | 2816 |
9 |
| Prad Research and Development Limited | 2693 |
9 |
| Weatherford Technology Holdings, LLC | 2027 |
8 |
| Sandvik Mining and Construction Oy | 837 |
8 |
| Cameron International Corporation | 1336 |
7 |
| Saudi Arabian Oil Company | 13263 |
7 |
| Frank's International, Inc. | 63 |
6 |
| Nabors Drilling Technologies USA, Inc. | 561 |
6 |
| Neodrill AS | 40 |
6 |
| Other owners | 295 |