Breath alcohol analyzer
US4809810A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1986 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | May 1, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/4972
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a system both apparatus and method, for analyzing a breath sample (22). A transducer (24) senses the pressure, temperature and humidity of the breath sample and in response generates a breath signature signal (26). A sensor (28) detects the alcohol content of the breath sample and in response generates an alcohol signal (30). Also included is a breath reference (32), and an alcohol reference (34) which includes an alcohol threshold level (36). A first comparator (38) compares the breath signature signal with the breath reference, and in response generates either a valid signal (40) if the signals substantially match or an invalid signal (44) if the signals do not substantially match. A second comparator compares the alcohol signal with the alcohol reference, and in response generates either a passing signal or a failing signal depending on whether or not the threshold level is exceeded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.