- 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 33/06 - Blow-out preventers
Patent holdings for IPC class E21B 33/06
Total number of patents in this class: 1528
10-year publication summary
|
151
|
160
|
132
|
134
|
94
|
83
|
84
|
70
|
74
|
32
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Schlumberger Technology Corporation | 10780 |
136 |
| Cameron International Corporation | 1335 |
123 |
| National Oilwell Varco, L.P. | 1682 |
105 |
| Hydril USA Distribution LLC | 213 |
73 |
| Schlumberger Canada Limited | 7332 |
57 |
| Services Petroliers Schlumberger | 5803 |
52 |
| Schlumberger Technology B.v. | 5176 |
51 |
| Halliburton Energy Services, Inc. | 20911 |
44 |
| Kinetic Pressure Control Limited | 81 |
42 |
| Saudi Arabian Oil Company | 13224 |
41 |
| Weatherford Technology Holdings, LLC | 2023 |
23 |
| Worldwide Oilfield Machine, Inc. | 51 |
21 |
| Electrical Subsea & Drilling AS | 42 |
20 |
| Mako Rentals, Inc. | 60 |
20 |
| Nabors Drilling Technologies USA, Inc. | 561 |
20 |
| Baker Hughes Oilfield Operations, LLC | 2302 |
20 |
| Grant Prideco, Inc. | 385 |
19 |
| Hydril USA Manufacturing LLC | 39 |
18 |
| Enovate Systems Limited | 52 |
17 |
| Cameron Technologies Limited | 212 |
17 |
| Other owners | 609 |