Intrusion alarm system for vehicles
US4658237A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1982 |
| Grant date | Apr 14, 1987 |
| Priority date | — |
| Expiry date | Apr 30, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R2325/304
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An alarm system (10) for detecting unauthorized intrusion into a vehicle and determining the location of such vehicle includes a vehicle alarm (11) and one or more networks (12, 13, 14) for receiving the output signal from vehicle alarm (11). Vehicle alarm (11) includes a transmitter (40) for broadcasting a low frequency modulated radio frequency alarm signal at the citizen band distress frequency and a control unit (25) for selectively activating the alarm upon a drop in the voltage magnitude of the vehicle power supply (27) induced by an unauthorized intrusion. Networks (12, 13, 14) respectively include citizen band radio detectors (15), mobile dedicated alarm detectors (16), and fixed dedicated alarm detectors (17) accompanied by a display unit (18).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.