Systems and methods for controlling railroad highway crossing flashers
US11208131B2 · kind B2 · utility
0Cited by
9References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 30, 2019 |
| Grant date | Dec 28, 2021 |
| Priority date | — |
| Expiry date | Feb 13, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/44
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A railroad crossing warning circuit includes a lamp and a signal generator for generating a first signal of a selected frequency. Divider circuitry divides the frequency of the signal to generate second signal at a flashing frequency. A switch responsive to the second signal controls current flow through the lamp and cause the lamp to flash at the flashing frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.