Proximity card detection system
US6535136B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1999 |
| Grant date | Mar 18, 2003 |
| Priority date | — |
| Expiry date | Feb 3, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7068
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A security system comprises a card containing access information, a reader for reading the card, a power source, a locking mechanism, and a first circuit for operating the locking mechanism. The power source is coupled to the first circuit to provide power to the first circuit. The power source is also coupled to a wake-up circuit to provide power to the wake-up circuit. The wake-up circuit detects the presence of an object and enables the reader to ascertain whether the object is the card. A method for operating the security system comprises first determining that electromagnetic energy is not being detected by the wake-up circuit, then determining that electromagnetic energy is being detected by the wake-up circuit, then determining that electromagnetic energy is not being detected by the wake-up circuit, and then ascertaining whether the object is the card.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.