1
G Daniel Chow: Method of discriminating breath contaminants and apparatus therefor. Intoximeters, Polster Polster and Lucchesi, September 17, 1991: US05048321 (25 worldwide citation)

A method of discriminating alcohols different from ethanol in breath samples includes sampling voltages from a fuel cell at a rapid rate to establish a curve rising, upon introduction of a sample containing a known amount of ethanol without interferants, from an initial base line to a peak; determin ...


2
Glenn C Forrester, Roger Allen, Roger Herrera, Daniel S Goldberger, James R Braig: Method for testing breath alcohol with discrimination between alveolar and upper respiratory tract alcohol. Intoximeters, Polster Lieder Woodruff & Lucchesi, December 27, 1994: US05376555 (17 worldwide citation)

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 dioxid ...


3
Glenn C Forrester: Method and apparatus for testing gases, particularly breath alcohol. Intoximeters, Polster Lieder Woodruff & Lucchesi, February 28, 1995: US05393495 (13 worldwide citation)

A method and apparatus for measuring the concentration of breath alcohol or other reactants is provided in which a breath sample is introduced to a fuel cell, wherein the number of electrons from the fuel cell resulting from oxidation of the alcohol in the breath rises to a peak and thereafter falls ...


4
Glenn C Forrester: System and method of checking calibration of breath alcohol measuring instrument with barometric pressure compensation. Intoximeters, Polster Lieder Woodruff & Lucchesi, March 28, 1995: US05400637 (8 worldwide citation)

A system and method for checking the calibration of a breath alcohol measuring instrument by the use of alcohol standards all containing substantially identical concentrations of alcohol and the use of a calculator which generates an expected measured value for the standard based on the known alcoho ...


5
Karl P Wolf, Macquorn R Forrester: Breath flow indicator. Intoximeters, Polster Polster and Lucchesi, May 17, 1988: US04744953 (5 worldwide citation)

In a portable breath alcohol detector using a standard tubular mouthpiece, a breath direction and continuity sensor takes the form of a whistle mounted at a predetermined distance from the discharge end of the mouthpiece to leave a gap, open to the ambient atmosphere, between the discharge end and t ...


6
Forrester Glenn C: Determining concentration of gas, particularly breath alcohol. Intoximeters, February 23, 1994: GB2269901-A (5 worldwide citation)

The gas is introduced to a fuel cell 1, the output of which rises to a peak and thereafter falls to a substantially steady minimum base to form a curve. The area under the curve is determined by analyzing the curve as a log-normal distribution curve, an analysis which is valid regardless of reactant ...


7
David J Bayer, M Rankine Forrester, Joe E Fodor Sr: Handheld breath tester housing and mouthpiece. Intoximeters, Alcotek, Armstrong Teasdale, July 6, 2010: US07749169 (4 worldwide citation)

A breath tester housing assembly is provided. The assembly comprises a housing having a base to be gripped by an operator, a display oriented to be in line with an operator's direct line of view while gripping the base, and a mouthpiece interface for interfacing with a removable mouthpiece so that w ...


8
David J Bayer, M Rankine Forrester: Methods and apparatus for breath alcohol testing. Intoximeters, Alcotek, Armstrong Teasdale, December 21, 2010: US07855027 (3 worldwide citation)

A fuel cell assembly includes a fuel cell, a fuel cell housing, and a diaphragm. The fuel cell housing includes an endwall and an inlet port extending through said endwall. The inlet port is for admitting a breath sample into the housing. The diaphragm is coupled within the housing such that a cavit ...


9
Glenn C Forrester, Roger Allen, Roger Herrera, Daniel S Goldberger, James R Braig: Apparatus for testing breath alcohol with discrimination between alveolar and upper respiratory tract alcohol. Intoximeters, Polster Lieder Woodruff & Lucchesi LC, October 17, 2006: US07122154 (3 worldwide citation)

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 dioxid ...


10
Forrester Macquorn R: Breath sample tube and method of making it. Intoximeters, Polster and Polster, February 18, 1975: US3867099 (1 worldwide citation)

Indium tubes are coated inside with 'Carbowax 1500,' and are used to encapsulate breath samples. The coating acts to passivate the indium surface preventing a decomposition reaction between the indium and any ethyl alcohol contained in the breath sample.