- All sections
- B - Performing operationstransporting
- B61L - Guiding railway trafficensuring the safety of railway traffic
- B61L 27/04 - Automatic systems, e.g. controlled by trainChange-over to manual control
Patent holdings for IPC class B61L 27/04
Total number of patents in this class: 458
10-year publication summary
|
47
|
49
|
36
|
34
|
36
|
56
|
41
|
42
|
39
|
40
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Transportation IP Holdings, LLC | 941 |
25 |
| Siemens Mobility GmbH | 1751 |
23 |
| BYD Company Limited | 5226 |
19 |
| Casco Signal Co., Ltd. | 147 |
17 |
| Mitsubishi Electric Corporation | 46618 |
15 |
| Westinghouse Air Brake Technologies Corporation | 503 |
15 |
| Parallel Systems, Inc. | 38 |
12 |
| Crsc Research & Design Institute Group Co., Ltd. | 134 |
11 |
| Siemens AG | 24346 |
10 |
| Casco Signal Ltd. | 59 |
9 |
| Traffic Control Technology Co., Ltd | 31 |
9 |
| Hyperloop Technologies, Inc. | 180 |
8 |
| Metrom Rail, LLC | 51 |
8 |
| Railserve, Inc. | 54 |
8 |
| Progress Rail Locomotive Inc. | 321 |
8 |
| Progress Rail Services Corp | 236 |
7 |
| Siemens Mobility, Inc. | 361 |
7 |
| Siemens Mobility SAS | 64 |
7 |
| Doppelmayr Management AG | 30 |
7 |
| Alstom Holdings | 617 |
6 |
| Other owners | 227 |