- 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 33/038 - Connectors used on well heads, e.g. for connecting blow-out preventer and riser
Patent holdings for IPC class E21B 33/038
Total number of patents in this class: 1024
10-year publication summary
|
112
|
107
|
109
|
102
|
83
|
77
|
87
|
66
|
39
|
14
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cameron International Corporation | 1305 |
75 |
| OneSubsea IP UK Limited | 378 |
53 |
| FMC Technologies, Inc. | 603 |
35 |
| Halliburton Energy Services, Inc. | 20165 |
30 |
| Schlumberger Technology Corporation | 9690 |
25 |
| Weatherford Technology Holdings, LLC | 2135 |
25 |
| Siemens AG | 24990 |
19 |
| Aker Solutions AS | 226 |
19 |
| FMC Kongsberg Subsea AS | 251 |
19 |
| Equinor Energy AS | 475 |
19 |
| Mako Rentals, Inc. | 61 |
17 |
| National Oilwell Varco, L.P. | 1604 |
16 |
| Trendsetter Engineering, Inc. | 45 |
16 |
| Vetco Gray Inc. | 163 |
14 |
| Schlumberger Canada Limited | 6913 |
13 |
| BP Corporation North America Inc. | 776 |
13 |
| Dril-Quip, Inc. | 155 |
13 |
| Baker Hughes Oilfield Operations, LLC | 1885 |
13 |
| Schlumberger Technology B.v. | 4951 |
12 |
| Aker Subsea AS | 130 |
12 |
| Other owners | 566 |