- 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 36/04 - Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
Patent holdings for IPC class E21B 36/04
Total number of patents in this class: 487
10-year publication summary
|
39
|
35
|
31
|
38
|
37
|
28
|
27
|
28
|
23
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 13949 |
57 |
| Harris Corporation | 1332 |
44 |
| ConocoPhillips Company | 1696 |
23 |
| Acceleware Ltd. | 53 |
16 |
| Halliburton Energy Services, Inc. | 21242 |
14 |
| Siemens AG | 24177 |
14 |
| Shell Internationale Research Maatschappij B.V. | 3440 |
12 |
| Aramco Services Company | 4162 |
11 |
| Athabasca Oil Corporation | 21 |
11 |
| Schlumberger Technology Corporation | 11549 |
9 |
| Shell Oil Company | 2089 |
9 |
| ExxonMobil Upstream Research Company | 2332 |
8 |
| Salamander Solutions Inc. | 16 |
7 |
| Eden GeoPower Inc. | 18 |
7 |
| Salamander IP Holdings LLC | 31 |
7 |
| Acergy France SAS | 132 |
6 |
| Baker Hughes Oilfield Operations, LLC | 2472 |
6 |
| Salamander International Holdings LLC | 27 |
6 |
| Salamander International LLC | 27 |
6 |
| Dmcx7318 Ltd | 27 |
6 |
| Other owners | 208 |