- 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 43/22 - Use of chemicals or bacterial activity
Patent holdings for IPC class E21B 43/22
Total number of patents in this class: 1626
10-year publication summary
|
167
|
111
|
49
|
88
|
58
|
48
|
31
|
21
|
7
|
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. | 20730 |
337 |
| Schlumberger Technology Corporation | 10608 |
68 |
| Schlumberger Canada Limited | 7222 |
65 |
| Schlumberger Technology B.v. | 5145 |
59 |
| Services Petroliers Schlumberger | 5749 |
59 |
| Baker Hughes Incorporated | 5295 |
51 |
| Schlumberger Holdings Limited | 2844 |
50 |
| Prad Research and Development Limited | 2695 |
49 |
| M-I L.L.C. | 816 |
33 |
| Shell Oil Company | 2141 |
32 |
| Shell Internationale Research Maatschappij B.V. | 3545 |
31 |
| Cenovus Energy Inc. | 422 |
28 |
| Saudi Arabian Oil Company | 12833 |
28 |
| Chevron U.S.A. Inc. | 3922 |
24 |
| Imperial Oil Resources Limited | 169 |
23 |
| Flotek Chemistry, LLC | 116 |
20 |
| ConocoPhillips Company | 1674 |
19 |
| Board of Regents, The University of Texas System | 5745 |
18 |
| SunCor Energy Inc. | 733 |
17 |
| Ecolab USA Inc. | 5444 |
15 |
| Other owners | 600 |