Cordless telephone system for moving conveyances
US5282239A · kind A · utility
28Cited by
4References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1992 |
| Grant date | Jan 25, 1994 |
| Priority date | — |
| Expiry date | Jul 8, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A cordless telephone system serves a building with a moving conveyance such as an elevator. The system has at least one portable cordless telephone, at least one fixed base station that communicates with the portable cordless telephone by a wireless circuit outside the moving conveyance, and a moving-conveyance base station that communicates with the portable cordless telephone by a wireless circuit inside the moving conveyance. A central switch routes calls to the fixed base station or moving-conveyance base station according to the field strength of signals received at these stations from the portable cordless telephone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.