- 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: 421
10-year publication summary
|
22
|
12
|
20
|
29
|
32
|
64
|
53
|
35
|
22
|
10
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20769 |
68 |
| Schlumberger Technology Corporation | 10641 |
38 |
| Landmark Graphics Corporation | 1522 |
26 |
| Saudi Arabian Oil Company | 12891 |
25 |
| Schlumberger Canada Limited | 7244 |
16 |
| Services Petroliers Schlumberger | 5763 |
15 |
| Schlumberger Technology B.v. | 5154 |
14 |
| Baker Hughes Incorporated | 5281 |
14 |
| Schlumberger Holdings Limited | 2840 |
10 |
| Chevron U.S.A. Inc. | 3939 |
10 |
| Prad Research and Development Limited | 2693 |
10 |
| Baker Hughes Oilfield Operations, LLC | 2273 |
7 |
| Weatherford Technology Holdings, LLC | 2012 |
6 |
| ConocoPhillips Company | 1676 |
5 |
| Hifi Engineering Inc. | 130 |
5 |
| Noetic Technologies Inc. | 120 |
5 |
| Baker Hughes Holdings LLC | 3006 |
5 |
| Astro Technology Group, LLC | 21 |
5 |
| Nike, Inc. | 14055 |
4 |
| Aramco Services Company | 3921 |
4 |
| Other owners | 129 |