Keyless vehicle lock system with distance measuring
US5293160A · kind A · utility
57Cited by
12References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 29, 1991 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | May 29, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2209/63
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A keyless lock system for a vehicle includes a card for transmitting a radio signal, at least one onboard antenna for receiving the radio signal, and a control unit for allowing and preventing keyless lock and unlock operations in dependence on the existence or nonexistence of the card in a predetermined area near the antenna. The control unit monitors the position of of at least one monitored door, and produces a card warning signal each time the monitored door is closed if the card is absent in the vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.