Patent holdings for IPC class E21C 27/22

Total number of patents in this class: 48

10-year publication summary

2
5
13
4
5
5
4
2
1
0
2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

Principal owners for this class

Owner
All patents
This class
Joy Global Underground Mining LLC
348
10
Sandvik Mining and Construction G.m.b.H.
91
8
Caterpillar Global Mining Europe GmbH
85
6
Sandvik Intellectual Property AB
1484
4
Novamera Inc.
11
4
Sandvik Mining and Construction Tools AB
173
3
Caterpillar Inc.
9530
1
Alliance Coal, LLC
7
1
China University of Mining and Technology
1247
1
Herrenknecht AG
203
1
Joy MM Delaware, Inc.
56
1
Northeastern University
538
1
Antraquip Corporation
1
1
Xuzhou Zhirun Mining Equipment Science and Technology Co., Ltd.
31
1
Bucyrus DBT Europe GmbH
10
1
AB Sandvik Materials Technology,
29
1
Sandvik Powder Solutions AB
2
1
Northern Colorado Constructors, Inc.
3
1
HE BEI Jing Long Intelligent Equipment Co., Ltd.
4
1
Other owners 0