Environmental abnormality detection apparatus
US4774502A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 27, 1987 |
| Grant date | Sep 27, 1988 |
| Priority date | — |
| Expiry date | Jul 27, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/11
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An environmental abnormality detection apparatus includes a detector for detecting environmental changes by monitoring physical changes in the environment and generating an output signal upon the detection of such an abnormality, a signal processor which generates an environmental abnormality signal based on the output of the detector, and a switching circuit connected between a pair of power source/signal lines. The apparatus further includes an oscillator and a control circuit which generates a signal for controlling the switching circuit obtained by the product of an output from the oscillator and the output of the signal processor. A power source is charged from the power source/signal lines, and supplies power to the detector, the signal processor and the oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.