- All sections
- E - Fixed constructions
- E21C - Mining or quarrying
- E21C 29/22 - Propulsion of machines for slitting or completely freeing the mineral from the seam by wheels, endless tracks, or the like
Patent holdings for IPC class E21C 29/22
Total number of patents in this class: 43
10-year publication summary
|
7
|
8
|
3
|
5
|
5
|
5
|
5
|
2
|
1
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Joy Global Underground Mining LLC | 344 |
13 |
| Sandvik Intellectual Property AB | 1394 |
6 |
| Wirtgen GmbH | 518 |
5 |
| Sandvik Mining and Construction G.m.b.H. | 94 |
2 |
| Underground Extraction Technologies Pty Ltd | 17 |
2 |
| Northern Colorado Constructors, Inc. | 3 |
2 |
| Optima Mining Systems Pty Ltd | 3 |
2 |
| Capella Partners XI LLC | 9 |
2 |
| Phoenix Boring, Inc. | 11 |
2 |
| Caterpillar Global Mining Highwall Miners LLC | 4 |
1 |
| Sandvik Mining and Construction Oy | 889 |
1 |
| Joy Global Surface Mining Inc | 371 |
1 |
| Chengdu Lieshizhe Rock-breaking Technology LLC. | 4 |
1 |
| Gacw Incorporated | 61 |
1 |
| Xinjiang University | 12 |
1 |
| Zhalainuoer Coal Industry Co., Ltd | 9 |
1 |
| Other owners | 0 |