- 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 43/30 - Specific pattern of wells, e.g. optimising the spacing of wells
Patent holdings for IPC class E21B 43/30
Total number of patents in this class: 876
10-year publication summary
|
77
|
65
|
66
|
71
|
59
|
81
|
54
|
36
|
47
|
16
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 12858 |
60 |
| Halliburton Energy Services, Inc. | 20749 |
51 |
| ConocoPhillips Company | 1676 |
51 |
| Cenovus Energy Inc. | 422 |
30 |
| Schlumberger Technology Corporation | 10627 |
29 |
| Landmark Graphics Corporation | 1522 |
26 |
| Schlumberger Canada Limited | 7235 |
24 |
| SunCor Energy Inc. | 735 |
24 |
| Shell Internationale Research Maatschappij B.V. | 3544 |
20 |
| Aramco Services Company | 3910 |
19 |
| ExxonMobil Upstream Research Company | 2411 |
19 |
| Eavor Technologies Inc. | 91 |
18 |
| Services Petroliers Schlumberger | 5756 |
15 |
| Nexen Energy ULC | 43 |
14 |
| Shell Oil Company | 2141 |
13 |
| Siemens AG | 24561 |
10 |
| Chevron U.S.A. Inc. | 3929 |
10 |
| Imperial Oil Resources Limited | 169 |
10 |
| PetroChina Company Limited | 676 |
10 |
| China University of Petroleum (East China) | 367 |
9 |
| Other owners | 414 |