- 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: 465
10-year publication summary
|
49
|
36
|
34
|
36
|
56
|
40
|
44
|
39
|
45
|
3
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Transportation IP Holdings, LLC | 961 |
25 |
| Siemens Mobility GmbH | 1805 |
23 |
| BYD Company Limited | 6041 |
19 |
| Casco Signal Co., Ltd. | 161 |
18 |
| Mitsubishi Electric Corporation | 47416 |
16 |
| Westinghouse Air Brake Technologies Corporation | 498 |
14 |
| Casco Signal Ltd. | 67 |
12 |
| Parallel Systems, Inc. | 38 |
12 |
| Progress Rail Locomotive Inc. | 332 |
11 |
| Crsc Research & Design Institute Group Co., Ltd. | 155 |
11 |
| Siemens AG | 24337 |
10 |
| Traffic Control Technology Co., Ltd | 31 |
9 |
| Metrom Rail, LLC | 52 |
8 |
| Siemens Mobility, Inc. | 369 |
8 |
| Progress Rail Services Corp | 222 |
7 |
| Railserve, Inc. | 51 |
7 |
| Siemens Mobility SAS | 64 |
7 |
| Doppelmayr Management AG | 31 |
7 |
| Alstom Holdings | 620 |
6 |
| Bombardier Transportation GmbH | 633 |
6 |
| Other owners | 229 |