Battery-saving arrangement for pagers
US4398192A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1981 |
| Grant date | Aug 9, 1983 |
| Priority date | — |
| Expiry date | Dec 4, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A pager or other selectively-addressed electronic device powered by a small power cell operates in four different modes and at two power levels, depending on signals received and a timing sequence. The device can stay active continuously, be activated at intervals or remain in a powered-down state. The address code assigned to a particular device would be transmitted at a predetermined time interval following a sync signal, thus the device can be powered-down until the approximate time period in which its address code could be transmitted. The system provides increased channel efficiency since information codes are superimposed on actual address codes, and there is no dead time in a channel while there are address codes waiting to be transmitted. The system is particularly well adapted to time multiplexing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.