The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 17, 2006
Filed:
Dec. 23, 1994
Glenn C. Forrester, Oakland, CA (US);
Roger Allen, Benicia, CA (US);
Roger Herrera, Oakland, CA (US);
Daniel S. Goldberger, Boulder, CO (US);
James R. Braig, Oakland, CA (US);
Glenn C. Forrester, Oakland, CA (US);
Roger Allen, Benicia, CA (US);
Roger Herrera, Oakland, CA (US);
Daniel S. Goldberger, Boulder, CO (US);
James R. Braig, Oakland, CA (US);
Intoximeters, Inc., St. Louis, MO (US);
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.