Multi-memory electronic identification tag
US5499017A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 1994 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Jun 3, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Multi-memory electronic identification tags (200) are utilized in short-range cooperative electronic identification systems comprised of readers (100) and tags (200) wherein a reader (100) may communicate with the tag (200) if the tag belongs to a certain class of tags. Communication is accomplished by a reader (100) establishing a reversing magnetic field (10) in the vicinity of a tag (200) and the (200) varying its absorption of power from the field (10) in accordance with the information to be transmitted. A first type of memory (258) is permanent and unalterable and used for storing data that is unique to the tag (200) and never needs to be changed. A second type of memory (252) is permanent but alterable and used for storing data that characterizes the object to which the tag (200) is attached. A third type of memory (259) is for the temporary storage of data produced by tag sensors (270,275).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.