- All sections
- B - Performing operationstransporting
- B61D - Body details or kinds of railway vehicles
- B61D 7/02 - Hopper cars with discharge openings in the bottoms
Patent holdings for IPC class B61D 7/02
Total number of patents in this class: 165
10-year publication summary
|
13
|
8
|
30
|
14
|
19
|
9
|
10
|
11
|
4
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| National Steel Car Limited | 150 |
30 |
| Trinity Rail Group, LLC | 111 |
16 |
| JAC Operations, Inc. | 52 |
15 |
| Gunderson LLC | 60 |
11 |
| Miner Enterprises, Inc. | 107 |
11 |
| Powerbrace Corporation | 40 |
11 |
| CRRC Qiqihar Rolling Stock Co., Ltd. | 111 |
8 |
| Trinity North American Freight Car, Inc. | 50 |
8 |
| Greenbrier Central, LLC | 16 |
5 |
| Drax Power Limited | 19 |
4 |
| Herzog Railroad Services, Inc. | 61 |
4 |
| Trinity Industries, Inc. | 73 |
4 |
| CRRC Yangtze Co., Ltd. | 84 |
4 |
| FreightCar America, Inc. | 5 |
3 |
| Sandbox Enterprises LLC | 137 |
3 |
| Aero Transportation Products, Inc. | 9 |
2 |
| Amsted Rail Company, Inc. | 435 |
2 |
| SunCoke Technology and Development LLC | 237 |
2 |
| CRRC Meishan Co., Ltd. | 23 |
2 |
| Railcar Innovations, LLC | 2 |
2 |
| Other owners | 18 |