Détention brevets de la classe E21B 47/20

Brevets de cette classe: 74

Historique des publications depuis 10 ans

7
5
5
4
5
3
9
12
6
0
2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

Propriétaires principaux

Proprétaire
Total
Cette classe
Halliburton Energy Services, Inc.
20769
19
China Petroleum & Chemical Corporation
1874
3
Institute of Geology and Geophysics, Chinese Academy of Sciences
324
3
Rime Downhole Technologies, LLC
27
3
Baker Hughes, a GE Company, LLC
2114
3
Schlumberger Technology Corporation
10641
2
Schlumberger Canada Limited
7244
2
China National Petroleum Corporation
424
2
Evolution Engineering Inc.
301
2
NCS Multistage Inc.
177
2
Saudi Arabian Oil Company
12891
2
Vertex Downhole Ltd.
5
2
Baker Hughes Oilfield Operations, LLC
2273
2
CNPC Engineering Technology R&D Company Limited
92
2
Sinopec Petroleum Engineering Technology Service Co., Ltd.
20
2
Geosteering & Logging Research Institute, Sinopec Matrix Corporation
10
2
Sinopec Matrix Corporation
10
2
Schlumberger Technology B.v.
5154
1
Schlumberger Holdings Limited
2840
1
APS Technology, Inc.
77
1
Autres propriétaires 16