07422723 is referenced by 9 patents and cites 38 patents.

A breath alcohol detection device includes a one-piece multi-passage block with attached sensors, a valve and a fuel cell. The cell accurately determines the BrAC of a prospective vehicle operator. In the event the BrAC is less than the legal maximum for a territory, the device unlocks an ignition interlock to permit starting of the engine and operation of the vehicle.

Title
Alcohol breath test device
Application Number
10/693114
Publication Number
7422723 (B1)
Application Date
October 24, 2003
Publication Date
September 9, 2008
Inventor
Harry Edwards Betsill
Parkton
MD, US
Agent
Hooker & Habib P C
Assignee
Alcohol Detection Systems
MD, US
IPC
G01N 33/00
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