Apparatus for suppressing automobile anti-theft arm/disarm system
US4996515A · kind A · utility
Inventors
Key dates
| Filing date | Apr 18, 1990 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Apr 18, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R25/1003
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An apparatus for automatically suppressing the audible arm and disarm signal associated with an automobile anti-theft system includes a control circuit connected between an anti-theft system and its sound emitter. A photoresistor cell is connected to the control circuit to indicate whether the light level is above or below a threshold level, e.g. to distinguish day from night. In the day, the control circuit is bypassed and the system functions normally. At night, the control circuit suppresses the system signal for a short interval, e.g. two seconds, to eliminate the audible arm and disarm signal. The short suppression interval does not significantly interfere with an intruder alarm signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.