Automatic identification system for objects or persons by remote interrogation
US5528221A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1993 |
| Grant date | Jun 18, 1996 |
| Priority date | — |
| Expiry date | Nov 16, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10039
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Automatic identification system for objects or persons by remote interrogation. The invention relates to an interrogating E/R (emitter/receiver) or gate associated with an answering E/R or tag having a digitized code identifying the same. The gate supplies four information types in the form of signals to the tags which answer "yes" or, by an absence of any answer, "no" until the gate has found their codes. When its code has been found, the tag is inhibited, thus permitting the detection of other codes. The invention more particularly applies to the monitoring of persons carrying answering E/Rs or to the billing of goods on sale in a large surface area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.