- 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 47/007 - Measuring stresses in a pipe string or casing
Patent holdings for IPC class E21B 47/007
Total number of patents in this class: 439
10-year publication summary
|
7
|
9
|
16
|
25
|
28
|
55
|
48
|
33
|
22
|
19
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20964 |
69 |
| Schlumberger Technology Corporation | 10898 |
40 |
| Landmark Graphics Corporation | 1524 |
26 |
| Saudi Arabian Oil Company | 13409 |
26 |
| Schlumberger Canada Limited | 7369 |
18 |
| Services Petroliers Schlumberger | 5830 |
17 |
| Schlumberger Technology B.v. | 5184 |
14 |
| Baker Hughes Incorporated | 5246 |
14 |
| Schlumberger Holdings Limited | 2800 |
10 |
| Chevron U.S.A. Inc. | 3996 |
10 |
| Prad Research and Development Limited | 2691 |
10 |
| Baker Hughes Oilfield Operations, LLC | 2331 |
7 |
| Weatherford Technology Holdings, LLC | 2028 |
6 |
| Noetic Technologies Inc. | 124 |
6 |
| Nike, Inc. | 14304 |
5 |
| Aramco Services Company | 4033 |
5 |
| ConocoPhillips Company | 1677 |
5 |
| Hifi Engineering Inc. | 131 |
5 |
| Baker Hughes Holdings LLC | 2999 |
5 |
| Astro Technology Group, LLC | 21 |
5 |
| Other owners | 136 |