Détention brevets de la classe E21B 47/113

Brevets de cette classe: 159

Historique des publications depuis 10 ans

6
5
7
13
19
13
29
25
16
4
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024

Propriétaires principaux

Proprétaire
Total
Cette classe
Halliburton Energy Services, Inc.
20165
41
Saudi Arabian Oil Company
11322
28
Schlumberger Technology Corporation
9690
8
Lytt Limited
51
6
Aramco Services Company
3504
5
California Institute of Technology
3884
4
Kemira Oyj
1167
4
Schlumberger Canada Limited
6913
3
Schlumberger Technology B.v.
4951
3
ConocoPhillips Company
1657
3
Hifi Engineering Inc.
125
3
Services Petroliers Schlumberger
5426
3
Baker Hughes Oilfield Operations, LLC
1885
3
Nike, Inc.
13075
2
Chevron U.S.A. Inc.
3774
2
Weatherford Technology Holdings, LLC
2135
2
China Petroleum & Chemical Corporation
1623
2
ExxonMobil Upstream Research Company
2525
2
Kemira Chemicals, Inc.
78
2
Petroleum Engineering Institute of Zyof Branch, Sinopec
3
2
Autres propriétaires 31