- 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: 471
10-year publication summary
|
52
|
41
|
35
|
42
|
62
|
44
|
47
|
41
|
45
|
12
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Siemens Mobility GmbH | 1844 |
25 |
| Transportation IP Holdings, LLC | 977 |
25 |
| Casco Signal Co., Ltd. | 176 |
21 |
| BYD Company Limited | 6271 |
19 |
| Mitsubishi Electric Corporation | 47683 |
16 |
| Westinghouse Air Brake Technologies Corporation | 490 |
14 |
| Casco Signal Ltd. | 71 |
13 |
| Parallel Systems, Inc. | 40 |
13 |
| Progress Rail Locomotive Inc. | 332 |
11 |
| Crsc Research & Design Institute Group Co., Ltd. | 158 |
11 |
| Siemens AG | 24177 |
10 |
| Traffic Control Technology Co., Ltd | 31 |
9 |
| Metrom Rail, LLC | 54 |
8 |
| Siemens Mobility, Inc. | 374 |
8 |
| Progress Rail Services Corp | 222 |
7 |
| Railserve, Inc. | 52 |
7 |
| Siemens Mobility SAS | 64 |
7 |
| Doppelmayr Management AG | 31 |
7 |
| Alstom Holdings | 625 |
6 |
| Bombardier Transportation GmbH | 584 |
6 |
| Other owners | 228 |