- 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 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: 497
10-year publication summary
|
68
|
70
|
39
|
35
|
31
|
38
|
37
|
28
|
23
|
9
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Harris Corporation | 1591 |
63 |
| Saudi Arabian Oil Company | 11322 |
44 |
| ConocoPhillips Company | 1657 |
22 |
| Shell Internationale Research Maatschappij B.V. | 3792 |
21 |
| Acceleware Ltd. | 49 |
17 |
| Halliburton Energy Services, Inc. | 20165 |
14 |
| Siemens AG | 24990 |
14 |
| Shell Oil Company | 2196 |
11 |
| Athabasca Oil Corporation | 21 |
11 |
| Aramco Services Company | 3504 |
10 |
| ExxonMobil Upstream Research Company | 2525 |
9 |
| Schlumberger Technology Corporation | 9690 |
7 |
| Salamander Solutions Inc. | 17 |
7 |
| Salamander IP Holdings LLC | 28 |
7 |
| Chevron U.S.A. Inc. | 3774 |
6 |
| Acergy France SAS | 124 |
6 |
| Salamander International Holdings LLC | 27 |
6 |
| Salamander International LLC | 27 |
6 |
| Dmcx7318 Ltd | 27 |
6 |
| Foret Plasma Labs, LLC | 85 |
5 |
| Other owners | 205 |