- 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 34/02 - Valve arrangements for boreholes or wells in well heads
Patent holdings for IPC class E21B 34/02
Total number of patents in this class: 1049
10-year publication summary
|
71
|
71
|
72
|
81
|
79
|
88
|
82
|
100
|
92
|
55
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1341 |
116 |
| Saudi Arabian Oil Company | 13349 |
77 |
| Schlumberger Technology Corporation | 10868 |
47 |
| Halliburton Energy Services, Inc. | 20944 |
45 |
| FMC Technologies, Inc. | 610 |
38 |
| Schlumberger Canada Limited | 7363 |
28 |
| Downing Wellhead Equipment, LLC | 50 |
21 |
| Petroleum Technology Company AS | 98 |
20 |
| Services Petroliers Schlumberger | 5827 |
20 |
| Schlumberger Technology B.v. | 5187 |
18 |
| Gulfstream Services, Inc. | 58 |
18 |
| Weatherford Technology Holdings, LLC | 2029 |
17 |
| Vault Pressure Control LLC | 69 |
17 |
| Ice Thermal Harvesting, LLC | 75 |
16 |
| Intelligent Wellhead Systems Inc. | 79 |
14 |
| Cameron Technologies Limited | 215 |
13 |
| National Oilwell Varco, L.P. | 1686 |
12 |
| Aramco Services Company | 4023 |
11 |
| Master Flo Valve Inc. | 41 |
11 |
| OneSubsea IP UK Limited | 423 |
11 |
| Other owners | 479 |