- 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 33/04 - Casing headsSuspending casings or tubings in well heads
Patent holdings for IPC class E21B 33/04
Total number of patents in this class: 1144
10-year publication summary
|
88
|
104
|
66
|
66
|
85
|
65
|
81
|
104
|
69
|
40
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1367 |
189 |
| Baker Hughes Oilfield Operations, LLC | 2555 |
61 |
| FMC Technologies, Inc. | 621 |
49 |
| Saudi Arabian Oil Company | 14390 |
47 |
| Innovex International, Inc | 128 |
42 |
| Weatherford Technology Holdings, LLC | 2167 |
38 |
| Vetco Gray Inc. | 137 |
38 |
| Schlumberger Canada Limited | 7616 |
35 |
| OneSubsea IP UK Limited | 440 |
33 |
| Cameron Technologies Limited | 234 |
33 |
| Schlumberger Technology Corporation | 11961 |
30 |
| Halliburton Energy Services, Inc. | 21299 |
27 |
| Vetco Gray, LLC | 142 |
25 |
| Services Petroliers Schlumberger | 6024 |
17 |
| Schlumberger Technology B.v. | 5289 |
16 |
| GE Oil & Gas Pressure Control LP | 71 |
14 |
| Cactus International LLC | 40 |
13 |
| Pruitt Tool & Supply Co. | 76 |
12 |
| Evolution Oil Tools Inc. | 23 |
10 |
| Stream-Flo Industries Ltd. | 66 |
10 |
| Other owners | 405 |