Method and apparatus for detecting a path of travel or direction of travel
US8120512B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2006 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | Jul 20, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/096791
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Spaced first and second signposts transmit wireless signals containing different signpost identifications. A first path of travel passes through the transmission range of the first signpost, and a second path of travel passes through the transmission range of the second signpost but not the transmission range of the first signpost. A different configuration includes plural hallways extending away from a common intersection in respective directions, with a respective signpost in each hallway that transmits wireless signals containing a respective different signpost identification. Another configuration includes a hallway with first and second portions of different width, a first signpost in the first portion transmitting wireless signals containing a first signpost identification, and spaced second and third signposts in the second portion each transmitting wireless signals containing a second signpost identification different from the first signpost identification, and having a transmission range less than a width of the second portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.