Remote control security system for automobile issuing a fixed basic code and two variable codes
US6320493A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R25/1003
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A remote control security system includes a remote control unit, a receiving unit, and an operation unit connected to the receiving unit for performing or cancelling an alarm function. A combination code having a basic code and two sets of remedy codes is produced by an encoder. When the receiver has received the signals from the remote control unit, a decoder compares the basic code and the two sets of remedy codes received by the receiver with a reference basic code and two sets of remedy codes generated by the encoder and, if the received and reference codes match, the decoder sends a control signal to the operation unit. One of the remedy codes is varied by a counter once each time the remote control button is pushed and the other is varied by the counter during the time that the button is being pushed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.