- 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: 488
10-year publication summary
|
52
|
41
|
35
|
42
|
62
|
42
|
47
|
41
|
47
|
30
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Siemens Mobility GmbH | 1896 |
28 |
| Transportation IP Holdings, LLC | 1021 |
26 |
| Casco Signal Co., Ltd. | 206 |
25 |
| BYD Company Limited | 6662 |
19 |
| Mitsubishi Electric Corporation | 48460 |
16 |
| Westinghouse Air Brake Technologies Corporation | 486 |
14 |
| Casco Signal Ltd. | 84 |
13 |
| Parallel Systems, Inc. | 40 |
13 |
| Siemens AG | 23934 |
11 |
| Progress Rail Locomotive Inc. | 337 |
11 |
| Crsc Research & Design Institute Group Co., Ltd. | 175 |
11 |
| Traffic Control Technology Co., Ltd | 31 |
9 |
| Metrom Rail, LLC | 55 |
8 |
| Siemens Mobility, Inc. | 375 |
8 |
| Progress Rail Services Corp | 217 |
7 |
| Railserve, Inc. | 51 |
7 |
| Siemens Mobility SAS | 64 |
7 |
| Doppelmayr Management AG | 30 |
7 |
| Alstom Holdings | 631 |
6 |
| BNSF Railway Company | 565 |
6 |
| Other owners | 236 |