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.
20749
337
Schlumberger Technology Corporation
10627
68
Schlumberger Canada Limited
7235
65
Schlumberger Technology B.v.
5148
59
Services Petroliers Schlumberger
5756
59
Baker Hughes Incorporated
5289
51
Schlumberger Holdings Limited
2841
50
Prad Research and Development Limited
2694
49
M-I L.L.C.
815
33
Shell Oil Company
2141
32
Shell Internationale Research Maatschappij B.V.
3544
31
Cenovus Energy Inc.
422
28
Saudi Arabian Oil Company
12858
28
Chevron U.S.A. Inc.
3929
24
Imperial Oil Resources Limited
169
23
Flotek Chemistry, LLC
116
20
ConocoPhillips Company
1676
19
Board of Regents, The University of Texas System
5751
18
SunCor Energy Inc.
735
17
Ecolab USA Inc.
5451
15
Other owners 600