Method and apparatus for determining alcohol concentration in th

Details Method and apparatus for determining alcohol concentration in th Method and apparatus for determining alcohol concentration in th

Filed on

1980-01-15

Date issued

1982-02-09

Examiner

Michell, Robert W.

Patent Class

Surgery

SubClass

Truss

SubSubClass

Pad

Other Related Categories

73 23, 73 29, 73R, A61B 500

Type

Patent

Status

active

Patent number

043145647

Description

ABSTRACT:
A method and apparatus for determining the alcohol concentration in the blood of a person by testing the person's breath, including, maintaining at least a minimum flow rate for the person's breath to form a test sample of the breath, measuring the alcohol amount in the test sample, measuring the increase in humidity in the test sample over ambient humidity and finding the ratio between the alcohol amount and the increase in humidity. This ratio is proportional to the actual alcohol concentration in the person's blood and cannot be disquised by a person wishing to falsify the results of the test.

REFERENCES:
patent: 3830630 (1974-08-01), Kiefer et al.
patent: 3831707 (1974-08-01), Takeuchi
patent: 4067320 (1978-01-01), Olsson et al.
patent: 4090078 (1978-05-01), Heim
patent: 4140106 (1979-02-01), Kirmaier

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