RFID tag having timing and environment modules
US6294997A · kind A · utility
415Cited by
13References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1999 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Oct 4, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An RFID tag is provided with a timing module to measure elapsed time and an environment module to detect certain environmental conditions. The RFID tag includes a transmitter/receiver, memory module, antenna module, converter, and the timing and environment modules. In an embodiment of the invention, the timing module enables the user, upon interrogating the RFID tag, to determine the precise length of time from the previous charge of the RFID tag. The environment module enables the user to determine how long the RFID tag has been exposed to certain environmental conditions that have been pre-defined by the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.