- 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: 491
10-year publication summary
|
70
|
39
|
35
|
31
|
38
|
37
|
28
|
27
|
26
|
10
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Harris Corporation | 1433 |
51 |
| Saudi Arabian Oil Company | 13155 |
50 |
| ConocoPhillips Company | 1673 |
23 |
| Acceleware Ltd. | 56 |
19 |
| Shell Internationale Research Maatschappij B.V. | 3540 |
15 |
| Halliburton Energy Services, Inc. | 20891 |
14 |
| Siemens AG | 24484 |
14 |
| Shell Oil Company | 2140 |
11 |
| Athabasca Oil Corporation | 21 |
11 |
| Aramco Services Company | 3969 |
10 |
| Schlumberger Technology Corporation | 10717 |
9 |
| ExxonMobil Upstream Research Company | 2397 |
8 |
| Salamander Solutions Inc. | 16 |
7 |
| Salamander IP Holdings LLC | 31 |
7 |
| Acergy France SAS | 128 |
6 |
| Baker Hughes Oilfield Operations, LLC | 2301 |
6 |
| Salamander International Holdings LLC | 27 |
6 |
| Salamander International LLC | 27 |
6 |
| Dmcx7318 Ltd | 27 |
6 |
| Foret Plasma Labs, LLC | 66 |
5 |
| Other owners | 207 |