RF/ID transponder system employing multiple transponders and a sensor switch
US5461385A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 1994 |
| Grant date | Oct 24, 1995 |
| Priority date | — |
| Expiry date | Apr 29, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C17/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An improved identification system that employs a novel radio frequency (RF) transponder. The RF transponder comprises a plurality of integrated circuit transponder chips, an RF transmit antenna coupled to an RF output of each of the transponder chips, and a sensor coupled to each of the plurality of transponder chips. A sensor switch is coupled between each of the transponder chips and the RF transmit antenna. The plurality of transponder chips may be individually programmed with different information, or identical information except for one bit. A code reader is coupled to an RF receive antenna for processing data transmitted by the transponder. The transponder is used to transfer information to the code reader relating to an item to which the sensor or transponder is coupled and the condition of the sensor switch. Transmission is accomplished by way of an RF communications link using the RF transmit and receive antennas. The transponder and identification system may thus be used with any application requiring sensor switch information and/or multiple sets of data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.