System for establishing a code and controlling operation of equipment
US4988992A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1989 |
| Grant date | Jan 29, 1991 |
| Priority date | — |
| Expiry date | Jul 27, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/00928
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system for establishing a code and controlling operation of equipment. This system includes a first transmitter including a random code generator and a memory for storing the randomly generated code, as well as a transmitter for providing a radio frequency signal carrying that code. The system furthermore includes a transceiver including a receiver for the siganl generated by the first transmitter and a memory for storing the code carried by that signal. The transceiver includes a second transmitter for transmitting a radio frequency signal carrying the code. This system also includes a remote receiver unit for connection to the equipment to be controlled. This remote receiver unit has a receiver for the radio frequency signal transmitted by either the first transmitter or the transceiver and a memory for storing that random code carried by the signal. The remote receiver also includes a comparator for comparing a code carried by a radio frequency signal with the code stored in the memory of the remote reciever unit. The remote receiver unit also includes an actuator for causing operation of the equipment if the receiver code matches the stored code. A method of using the system …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.