- All sections
- B - Performing operationstransporting
- B61D - Body details or kinds of railway vehicles
- B61D 7/04 - Hopper cars with discharge openings in the bottoms the openings being above axle level during discharge
Patent holdings for IPC class B61D 7/04
Total number of patents in this class: 5
10-year publication summary
|
3
|
0
|
0
|
1
|
1
|
0
|
0
|
0
|
0
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| National Steel Car Limited | 147 |
5 |
| Other owners | 0 |