Frequency modulation digital code anti-theft system
US5473200A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 8, 1993 |
| Grant date | Dec 5, 1995 |
| Priority date | — |
| Expiry date | Oct 8, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R2325/304
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A theft prevention device that includes a digital control unit and digital receiving units. These digital components form a control system along with existing peripheral components. The control system utilizes a signal network where signals are transmitted and received on the existing wiring or through the air between the digital components. The components of the anti-theft device operate in either an armed or disarmed state, and the system automatically arms whenever the ignition key is turned from on to off. If the system is in a vehicle and the vehicle is started without disarming the system first, each component becomes active after its programmed time delay has elapsed. A unique code, generated by the digital control unit, is passed through alarm system's signal network during the disarmed state such that the digital components in the theft prevention device becomes active and perform their respective functions even if the power supply is cut in the armed state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.