- All sections
- B - Performing operations; transporting
- B61L - Guiding railway traffic; ensuring the safety of railway traffic
- B61L 27/04 - Automatic systems, e.g. controlled by train; Change-over to manual control
Patent holdings for IPC class B61L 27/04
Total number of patents in this class: 409
10-year publication summary
|
14
|
52
|
52
|
41
|
35
|
41
|
62
|
46
|
48
|
21
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Transportation IP Holdings, LLC | 843 |
22 |
| Siemens Mobility GmbH | 1550 |
21 |
| BYD Company Limited | 3700 |
16 |
| Westinghouse Air Brake Technologies Corporation | 521 |
16 |
| Mitsubishi Electric Corporation | 43934 |
14 |
| Siemens AG | 24990 |
11 |
| Casco Signal Co., Ltd. | 94 |
11 |
| Traffic Control Technology Co., Ltd | 31 |
9 |
| Hyperloop Technologies, Inc. | 207 |
8 |
| Metrom Rail, LLC | 47 |
8 |
| Alstom Transport Technologies | 566 |
7 |
| Casco Signal Ltd. | 34 |
7 |
| Railserve, Inc. | 26 |
7 |
| Progress Rail Locomotive Inc. | 304 |
7 |
| Siemens Mobility, Inc. | 329 |
7 |
| GE Global Sourcing LLC | 944 |
7 |
| Clone667, LLC | 10 |
7 |
| Ground Transportation Systems Canada Inc. | 116 |
7 |
| Bombardier Transportation GmbH | 682 |
6 |
| Siemens Mobility SAS | 62 |
6 |
| Other owners | 205 |