- All sections
- B - Performing operations; transporting
- B61L - Guiding railway traffic; ensuring the safety of railway traffic
- B61L 27/33 - Backup systems, e.g. switching when failures occur
Patent holdings for IPC class B61L 27/33
Total number of patents in this class: 4
10-year publication summary
|
1
|
0
|
0
|
0
|
0
|
0
|
2
|
1
|
0
|
2
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| BYD Company Limited | 3700 |
1 |
| International Electronic Machines Corporation | 110 |
1 |
| Casco Signal Co., Ltd. | 94 |
1 |
| Acorn Technology Systems, Inc. | 4 |
1 |
| Other owners | 0 |