- 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 33/068 - Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells
Patent holdings for IPC class E21B 33/068
Total number of patents in this class: 844
10-year publication summary
|
94
|
80
|
96
|
90
|
95
|
62
|
59
|
48
|
36
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1322 |
83 |
| Halliburton Energy Services, Inc. | 20419 |
41 |
| Saudi Arabian Oil Company | 12423 |
37 |
| Schlumberger Technology Corporation | 10241 |
26 |
| Schlumberger Canada Limited | 7147 |
23 |
| Cameron Technologies Limited | 246 |
23 |
| Oil States Energy Services, L.L.C. | 75 |
22 |
| Downing Wellhead Equipment, LLC | 46 |
21 |
| Weatherford Technology Holdings, LLC | 2105 |
19 |
| Wells Fargo Bank, National Association | 3521 |
19 |
| Vault Pressure Control LLC | 70 |
19 |
| Schlumberger Technology B.v. | 5068 |
18 |
| Services Petroliers Schlumberger | 5626 |
18 |
| FMC Technologies, Inc. | 586 |
16 |
| DYNAenergetics Europe GmbH | 228 |
16 |
| Isolation Equipment Services Inc. | 22 |
14 |
| SPM Oil & Gas Inc. | 316 |
14 |
| Gulfstream Services, Inc. | 56 |
12 |
| Stream-Flo Industries Ltd. | 74 |
9 |
| National Oilwell Varco, L.P. | 1628 |
8 |
| Other owners | 386 |