Map distribution system and terminal device used in the same
US7133773B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2003 |
| Grant date | Nov 7, 2006 |
| Priority date | — |
| Expiry date | Jan 2, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/3896
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A map distribution system, includes an information center that stores the latest map information and a terminal device including a communication unit, a map storing unit, and a control information storing unit. The communication unit transmits information to the information center and receives information from the information center. The map storing unit stores map information. The control information storing unit stores control information associated with the map information. The terminal device transmits the control information to the information center every prescribed timings. The information center transmits the latest control information to the terminal device in response to the transmitted control information. The terminal device rewrites the control information stored in the control information storing unit to the latest control information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.