Patent holdings for IPC class E21B 19/22

Total number of patents in this class: 903

10-year publication summary

83
59
85
64
58
53
50
32
42
27
2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

Principal owners for this class

Owner
All patents
This class
Halliburton Energy Services, Inc.
20835
74
Schlumberger Technology Corporation
10662
57
Premier Coil Solutions, Inc.
70
42
National Oilwell Varco, L.P.
1661
36
Schlumberger Canada Limited
7273
25
Schlumberger Technology B.v.
5161
24
Services Petroliers Schlumberger
5772
24
Stimline AS
27
18
Saudi Arabian Oil Company
12947
16
Schlumberger Holdings Limited
2835
14
Itrec B.V.
503
14
Weatherford Technology Holdings, LLC
2015
13
Baker Hughes Holdings LLC
3005
13
Prad Research and Development Limited
2693
12
Coil Solutions, Inc.
19
11
Celtic Machining Ltd.
11
10
Tetra Technologies, Inc.
102
9
Xtreme Drilling and Coil Services Corp.
14
9
Baker Hughes Incorporated
5277
8
Athabasca Oil Corporation
21
7
Other owners 467