- 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 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: 575
10-year publication summary
|
59
|
61
|
55
|
55
|
44
|
45
|
45
|
21
|
28
|
8
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| OneSubsea IP UK Limited | 378 |
60 |
| Cameron International Corporation | 1305 |
43 |
| FMC Technologies, Inc. | 603 |
31 |
| Halliburton Energy Services, Inc. | 20165 |
25 |
| Schlumberger Technology Corporation | 9690 |
23 |
| Expro North Sea Limited | 215 |
23 |
| S+s Industries Technology LLC | 25 |
17 |
| FMC Kongsberg Subsea AS | 251 |
12 |
| Baker Hughes Energy Technology UK Limited | 168 |
12 |
| Aker Solutions AS | 226 |
11 |
| Interventek Subsea Engineering Limited | 18 |
10 |
| ConocoPhillips Company | 1657 |
9 |
| Schlumberger Canada Limited | 6913 |
8 |
| Schlumberger Technology B.v. | 4951 |
8 |
| Dril-Quip, Inc. | 155 |
8 |
| Services Petroliers Schlumberger | 5426 |
8 |
| Trendsetter Engineering, Inc. | 45 |
7 |
| Weatherford Technology Holdings, LLC | 2135 |
6 |
| National Coupling Company, Inc. | 61 |
6 |
| FMC Technologies do Brasil Ltda. | 64 |
6 |
| Other owners | 242 |