- 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 33/00 - Sealing or packing boreholes or wells
Patent holdings for IPC class E21B 33/00
Total number of patents in this class: 383
10-year publication summary
|
31
|
32
|
36
|
25
|
17
|
5
|
5
|
6
|
1
|
2
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20946 |
49 |
| Baker Hughes Incorporated | 5248 |
18 |
| Schlumberger Technology Corporation | 10881 |
14 |
| Baker Hughes Holdings LLC | 3001 |
13 |
| Schlumberger Canada Limited | 7366 |
11 |
| Schlumberger Technology B.v. | 5183 |
11 |
| Schlumberger Holdings Limited | 2803 |
11 |
| Services Petroliers Schlumberger | 5828 |
11 |
| Cameron International Corporation | 1342 |
10 |
| Prad Research and Development Limited | 2692 |
10 |
| Vetco Gray, LLC | 149 |
9 |
| Baker Hughes, a GE Company, LLC | 2110 |
8 |
| Weatherford Technology Holdings, LLC | 2029 |
7 |
| National Oilwell Varco, L.P. | 1686 |
7 |
| FMC Technologies, Inc. | 609 |
6 |
| ConocoPhillips Company | 1675 |
5 |
| Saudi Arabian Oil Company | 13372 |
5 |
| Baker Hughes Oilfield Operations, LLC | 2322 |
5 |
| Grant Prideco, Inc. | 387 |
4 |
| M-I L.L.C. | 815 |
4 |
| Other owners | 165 |