Détention brevets de la classe E21B 47/26

Brevets de cette classe: 661

Historique des publications depuis 10 ans

33
26
11
20
30
39
103
92
41
5
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024

Propriétaires principaux

Proprétaire
Total
Cette classe
Halliburton Energy Services, Inc.
20165
123
Schlumberger Canada Limited
6913
73
Schlumberger Technology Corporation
9690
66
Services Petroliers Schlumberger
5426
60
Schlumberger Technology B.v.
4951
37
Landmark Graphics Corporation
1526
37
Saudi Arabian Oil Company
11322
29
Geoquest Systems B.V.
584
21
Baker Hughes Incorporated
5689
17
Prad Research and Development Limited
2696
15
Schlumberger Holdings Limited
2947
14
Baker Hughes Oilfield Operations, LLC
1885
13
Sanvean Technologies LLC
39
11
Weatherford Technology Holdings, LLC
2135
7
Aramco Services Company
3504
6
Evolution Engineering Inc.
313
5
Petrolink International Ltd.
22
5
ExxonMobil Upstream Research Company
2525
4
Reflex Instruments Asia Pacific Pty Ltd
83
4
China Petroleum & Chemical Corporation
1623
3
Autres propriétaires 111