1
Richard U Guth: Breath test mouthpiece. Thomas Hooker, October 6, 1981: US04292978 (13 worldwide citation)

A breath-test mouthpiece of the type used to remove solids, saliva and water vapor from the breath of a subject being tested to determine a breath constituent, typically breath alcohol, including axially-aligned mouth and tube pipes with a hollow central collector having a lip-engaging edge to eithe ...


2
Guth Richard U: Embout, Mouthpiece. Guth Richard U, MACRAE & CO, June 21, 1983: CA1148383

Attorney's Case No. 226 MOUTHPIECE Abstract of the Disclosure A breath-test mouthpiece of the type used to remove solids,saliva and water vapor from the breath of a subject being testedto determine a breath constituent, typically breath alcohol,including axially-aligned mouth and tube pipes with a h ...