- 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: 492
10-year publication summary
|
30
|
26
|
25
|
32
|
30
|
23
|
25
|
26
|
21
|
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 | 13904 |
55 |
| Harris Corporation | 1361 |
47 |
| ConocoPhillips Company | 1699 |
23 |
| Acceleware Ltd. | 57 |
19 |
| Halliburton Energy Services, Inc. | 21144 |
14 |
| Siemens AG | 24329 |
14 |
| Shell Internationale Research Maatschappij B.V. | 3497 |
14 |
| Aramco Services Company | 4158 |
11 |
| Athabasca Oil Corporation | 21 |
11 |
| Shell Oil Company | 2113 |
10 |
| Schlumberger Technology Corporation | 11349 |
9 |
| ExxonMobil Upstream Research Company | 2348 |
8 |
| Salamander Solutions Inc. | 16 |
7 |
| Salamander IP Holdings LLC | 31 |
7 |
| Acergy France SAS | 132 |
6 |
| Baker Hughes Oilfield Operations, LLC | 2424 |
6 |
| Eden GeoPower Inc. | 17 |
6 |
| Salamander International Holdings LLC | 27 |
6 |
| Salamander International LLC | 27 |
6 |
| Dmcx7318 Ltd | 27 |
6 |
| Other owners | 207 |