- 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 33/064 - Blow-out preventers specially adapted for underwater well heads
Patent holdings for IPC class E21B 33/064
Total number of patents in this class: 598
10-year publication summary
|
96
|
69
|
55
|
41
|
37
|
31
|
30
|
13
|
12
|
5
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Hydril USA Distribution LLC | 223 |
45 |
| Cameron International Corporation | 1369 |
44 |
| Schlumberger Technology Corporation | 11522 |
32 |
| Transocean Innovation Labs Ltd | 43 |
23 |
| National Oilwell Varco, L.P. | 1690 |
20 |
| Mako Rentals, Inc. | 45 |
18 |
| OneSubsea IP UK Limited | 434 |
18 |
| Grant Prideco, Inc. | 429 |
17 |
| Trendsetter Engineering, Inc. | 51 |
17 |
| Halliburton Energy Services, Inc. | 21230 |
16 |
| Weatherford Technology Holdings, LLC | 2069 |
14 |
| Schlumberger Canada Limited | 7564 |
12 |
| Trendsetter Vulcan Offshore, Inc. | 63 |
12 |
| Transocean Sedco Forex Ventures Limited | 47 |
12 |
| FMC Technologies, Inc. | 607 |
11 |
| Kinetic Pressure Control Limited | 90 |
11 |
| BP Corporation North America Inc. | 743 |
10 |
| Schlumberger Technology B.v. | 5269 |
9 |
| Expro North Sea Limited | 234 |
8 |
| Services Petroliers Schlumberger | 5979 |
8 |
| Other owners | 241 |