Method and apparatus for locating objects using radio frequency identification
US8299924B2 · kind B2 · utility
3Cited by
51References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2007 |
| Grant date | Oct 30, 2012 |
| Priority date | — |
| Expiry date | Mar 22, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for detecting non-linear tags. In one advantageous embodiment a system for detecting non-linear tags has a transmitter and a receiver. The transmitter transmits a plurality of electromagnetic signals having a first frequency and a second frequency. The receiver monitors for an electromagnetic signal having a frequency equal to a difference between the first frequency and a second frequency that is generated by a non-linear tag in response to receiving the plurality of electromagnetic signals, wherein the non-linear tag is detected when the electromagnetic signal is detected by the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.