- 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 |