- 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 21/01 - Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
Patent holdings for IPC class E21B 21/01
Total number of patents in this class: 568
10-year publication summary
|
61
|
60
|
76
|
52
|
38
|
47
|
36
|
42
|
37
|
10
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20165 |
82 |
| National Oilwell Varco, L.P. | 1604 |
23 |
| Schlumberger Technology Corporation | 9690 |
21 |
| Saudi Arabian Oil Company | 11322 |
21 |
| M-I L.L.C. | 893 |
20 |
| Schlumberger Canada Limited | 6913 |
15 |
| Schlumberger Technology B.v. | 4951 |
15 |
| Services Petroliers Schlumberger | 5426 |
14 |
| Nabors Drilling Technologies USA, Inc. | 533 |
11 |
| Baker Hughes Incorporated | 5689 |
9 |
| Weatherford Technology Holdings, LLC | 2135 |
9 |
| Performance Pulsation Control, Inc. | 57 |
8 |
| Schlumberger Holdings Limited | 2947 |
7 |
| Katch Kan Holdings Ltd. | 52 |
7 |
| Prad Research and Development Limited | 2696 |
7 |
| Aramco Services Company | 3504 |
6 |
| Recover Energy Services Inc. | 52 |
6 |
| Grant Prideco, Inc. | 384 |
5 |
| Shell USA, Inc. | 1074 |
5 |
| Covar Applied Technologies, Inc. | 11 |
4 |
| Other owners | 273 |