Keyless entry system for automotive devices with compact, portable wireless code transmitter, and feature for preventing users from locking transmitter in vehicle
US4672375A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1985 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Apr 10, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/5978
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A keyless entry system allows operation of various vehicle devices including a door lock without using a mechanical key, such as an ignition key. The system comprises a wireless, portable transmitter adapted to produce a radio signal indicative of a unique code preset in the transmitter, and a controller mounted on the vehicle and associated with the vehicle devices. The controller has a preset code to compare with the unique code indicative in the radio signal transmitted from the transmitter. The controller also detects impending or accomplished locking of the transmitter in the vehicle and produces an alarm and subsequently disables the keyless entry system unless the transmitter is removed from the vehicle within a given period of time after the alarm is given.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.