Radio signal receiving apparatus with a security circuitry
US4378551A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 1980 |
| Grant date | Mar 29, 1983 |
| Priority date | — |
| Expiry date | Dec 5, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A radio signal receiving apparatus such as a pager with a security circuitry includes operator-controlled switches for providing a plurality of different command signals which are used to actuate the receiving apparatus in a different mode of operation, an interface circuitry with an optional feature circuitry coupled to the receiving circuitry of the apparatus for providing various optional functions such as automatic reset, single/dual function or battery saving functions to the receiving apparatus, and a security circuitry for preventing the receiving apparatus from receiving the incoming signal once tampering of the optional feature security is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.