Détention brevets de la classe E21B 47/092

Brevets de cette classe: 254

Historique des publications depuis 10 ans

19
6
9
19
19
36
39
30
20
7
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024

Propriétaires principaux

Proprétaire
Total
Cette classe
Halliburton Energy Services, Inc.
20165
75
Schlumberger Technology Corporation
9690
15
Saudi Arabian Oil Company
11322
11
Intelligent Wellhead Systems Inc.
77
10
Hunting Titan, Inc.
240
8
Advanced Upstream Ltd.
35
8
Baker Hughes Incorporated
5689
7
Weatherford Technology Holdings, LLC
2135
7
CARBO Ceramics Inc.
248
7
The Charles Machine Works, Inc.
411
7
Baker Hughes Oilfield Operations, LLC
1885
6
Schlumberger Canada Limited
6913
5
Schlumberger Technology B.v.
4951
5
Services Petroliers Schlumberger
5426
5
Schlumberger Holdings Limited
2947
4
Prad Research and Development Limited
2696
4
Scientific Drilling International, Inc.
161
4
Aramco Services Company
3504
3
Cameron International Corporation
1305
3
Magnetic Variation Services, LLC
34
3
Autres propriétaires 57