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