Emergency telephone actuated signal light or the like device and method
US4935951A · kind A · utility
60Cited by
13References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1989 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Nov 27, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An emergency telephone call actuated light signal is visible externally of the building includes a telephone line monitor and a microcontroller for comparing the dialed numbers with a stored emergency number. If the microcontroller detects a match, it emits an actuation signal which causes operation of a light signal visible on the exterior of the building. The microcontroller includes logic for discriminating between a stored emergency number containing a series of digits and a dialed number containing the stored number sequence as a part of greater series of digits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.