- 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 33/05 - Cementing-heads, e.g. having provision for introducing cementing plugs
Patent holdings for IPC class E21B 33/05
Total number of patents in this class: 186
10-year publication summary
|
9
|
14
|
21
|
8
|
13
|
10
|
12
|
9
|
12
|
6
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Gulfstream Services, Inc. | 58 |
25 |
| Halliburton Energy Services, Inc. | 20835 |
20 |
| Weatherford Technology Holdings, LLC | 2015 |
9 |
| Frank's International, LLC | 238 |
9 |
| Cameron International Corporation | 1332 |
7 |
| Wells Fargo Bank, National Association | 3784 |
7 |
| Saudi Arabian Oil Company | 12947 |
6 |
| Schlumberger Canada Limited | 7273 |
5 |
| Schlumberger Technology B.v. | 5161 |
5 |
| Services Petroliers Schlumberger | 5772 |
5 |
| Schlumberger Holdings Limited | 2835 |
4 |
| Baker Hughes Incorporated | 5277 |
4 |
| ConocoPhillips Company | 1677 |
4 |
| Nabors Drilling Technologies USA, Inc. | 557 |
4 |
| Prad Research and Development Limited | 2693 |
4 |
| Thru Tubing Solutions, Inc. | 376 |
4 |
| CURTIS, Philip, Anthony | 436 |
4 |
| Klimack Holdings Inc. | 17 |
3 |
| Mako Rentals, Inc. | 60 |
3 |
| Baker Hughes Oilfield Operations, LLC | 2288 |
3 |
| Other owners | 51 |