Personnel safety utilizing time variable frequencies
US8248263B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 9, 2009 |
| Grant date | Aug 21, 2012 |
| Priority date | — |
| Expiry date | Jul 27, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/0092
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system to improve safety of workers who are in proximity to mobile machines includes a machine mountable radio-frequency identification reader that wirelessly monitors radio-frequency identification tags worn by workers moving relative to and in proximity to a mobile machine when the reader is mounted on the machine. The reader includes a processor and an antenna front-end which is switchable between an omni-directional antenna or at least one directional antenna. The omni-directional antenna is mountable so as to monitor a machine circumference completely around the mobile machine. Each directional antenna is mountable so as to monitor only either a front or a back of the mobile machine relative to the machine's direction of motion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.