- 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 34/04 - Valve arrangements for boreholes or wells in well heads in underwater well heads
Patent holdings for IPC class E21B 34/04
Total number of patents in this class: 595
10-year publication summary
|
56
|
54
|
52
|
42
|
43
|
41
|
21
|
29
|
19
|
9
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| OneSubsea IP UK Limited | 423 |
61 |
| Cameron International Corporation | 1342 |
43 |
| FMC Technologies, Inc. | 609 |
32 |
| Schlumberger Technology Corporation | 10881 |
25 |
| Halliburton Energy Services, Inc. | 20946 |
25 |
| Expro North Sea Limited | 232 |
23 |
| S+s Industries Technology LLC | 24 |
19 |
| Baker Hughes Energy Technology UK Limited | 215 |
14 |
| Aker Solutions AS | 243 |
11 |
| Schlumberger Canada Limited | 7366 |
10 |
| ConocoPhillips Company | 1675 |
10 |
| Interventek Subsea Engineering Limited | 18 |
10 |
| Schlumberger Technology B.v. | 5183 |
9 |
| Services Petroliers Schlumberger | 5828 |
9 |
| TechnipFMC Norge AS | 85 |
9 |
| FMC Kongsberg Subsea AS | 185 |
8 |
| Trendsetter Engineering, Inc. | 52 |
8 |
| Cameron Technologies Limited | 215 |
7 |
| National Coupling Company, Inc. | 62 |
6 |
| FMC Technologies do Brasil Ltda. | 66 |
6 |
| Other owners | 250 |