Apparatus for testing breath alcohol with discrimination...

Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing gas sample

Reexamination Certificate

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C422S093000, C128S126100

Reexamination Certificate

active

07122154

ABSTRACT:
A method and infrared sensing device for determining the concentration of alveolar alcohol in a breath sample exhaled by a subject into an infrared sensing device. The presence of alcohol from the upper respiratory tract of the subject is detected by continuously monitoring alcohol and carbon dioxide, normalizing alcohol values with respect to carbon dioxide, calculating a difference between normalized alcohol concentration and carbon dioxide concentration over time, integrating (summing) the difference, and comparing the integrated difference with a threshold. This technique accurately and consistently detects the presence of mouth alcohol in the sample before the presence of carbon dioxide which originates in deep lung breath.

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patent: 4090078 (1978-05-01), Heim
patent: 4268751 (1981-05-01), Fritzlen et al.
patent: 4314564 (1982-02-01), Albarda
patent: 4363635 (1982-12-01), Hutson
patent: 4736619 (1988-04-01), Legrand
patent: 5048321 (1991-09-01), Chow

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