- 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: 1116
10-year publication summary
|
95
|
77
|
88
|
58
|
58
|
72
|
53
|
68
|
99
|
58
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1353 |
183 |
| Baker Hughes Oilfield Operations, LLC | 2393 |
60 |
| FMC Technologies, Inc. | 608 |
49 |
| Saudi Arabian Oil Company | 13686 |
45 |
| Weatherford Technology Holdings, LLC | 2034 |
38 |
| Vetco Gray Inc. | 147 |
38 |
| Innovex International, Inc | 120 |
37 |
| Schlumberger Canada Limited | 7440 |
34 |
| OneSubsea IP UK Limited | 424 |
32 |
| Cameron Technologies Limited | 219 |
32 |
| Schlumberger Technology Corporation | 11075 |
30 |
| Vetco Gray, LLC | 151 |
28 |
| Halliburton Energy Services, Inc. | 21090 |
27 |
| Services Petroliers Schlumberger | 5885 |
17 |
| Schlumberger Technology B.v. | 5224 |
16 |
| GE Oil & Gas Pressure Control LP | 74 |
15 |
| Stream-Flo Industries Ltd. | 72 |
13 |
| Baker Hughes Pressure Control LP | 34 |
12 |
| Pruitt Tool & Supply Co. | 71 |
11 |
| Chevron U.S.A. Inc. | 4020 |
10 |
| Other owners | 389 |