Fire gas detector-coding
US8198997B2 · kind B2 · utility
0Cited by
3References
18Claims
0Family size
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Key dates
| Filing date | Sep 28, 2009 |
| Grant date | Jun 12, 2012 |
| Priority date | — |
| Expiry date | Feb 5, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/183
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A detector comprises a detector base and a sensor, first and second resistors connected in series, a DC voltage source (Vref) connected to the resistors, and means for monitoring the voltage at the midpoint of a potential divider constituted by the series-connected resistors. The first and second resistors are rated so that the midpoint voltage is indicative of the date of manufacture of the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.