Programmable vehicle anti-theft system
US4990906A · kind A · utility
42Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1988 |
| Grant date | Feb 5, 1991 |
| Priority date | — |
| Expiry date | Nov 29, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/00714
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicle anti-theft device is disclosed which includes an electronically erasable programmable read only memory (EEPROM) which stores a modifiable code which must be matched by an input code in order to start the vehicle. The ignition key includes a resistor pellet, engaged by contact in the ignition lock assembly, which is measured to provide the input code. To avoid problems associated with intermittent contact engagement with the resistor pellet, circuitry is provided to control the resistor measurement cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.