- 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 15/00 - Supports for the drilling machine, e.g. derricks or masts
Patent holdings for IPC class E21B 15/00
Total number of patents in this class: 1018
10-year publication summary
|
89
|
107
|
86
|
86
|
76
|
61
|
51
|
25
|
26
|
21
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nabors Drilling Technologies USA, Inc. | 561 |
82 |
| National Oilwell Varco, L.P. | 1682 |
82 |
| Schlumberger Technology Corporation | 10820 |
68 |
| Schlumberger Canada Limited | 7350 |
38 |
| Itrec B.V. | 502 |
36 |
| Services Petroliers Schlumberger | 5817 |
34 |
| Schlumberger Technology B.v. | 5181 |
32 |
| Saudi Arabian Oil Company | 13295 |
16 |
| Caterpillar Global Mining Equipment LLC | 160 |
15 |
| Entro Industries, Inc. | 44 |
14 |
| Nabors Industries, Inc. | 37 |
13 |
| Helmerich & Payne, Inc. | 55 |
11 |
| Swivel Rental & Supply, L.L.C. | 12 |
10 |
| Halliburton Energy Services, Inc. | 20949 |
9 |
| Sandvik Mining and Construction Oy | 836 |
9 |
| Prostar Energy Technologies (USA) LLC | 14 |
9 |
| T & T Engineering Services, Inc. | 24 |
8 |
| Joy Global Surface Mining Inc | 366 |
8 |
| Athabasca Oil Corporation | 21 |
7 |
| Apollo Energy Services Corp. | 11 |
6 |
| Other owners | 511 |