04579826 is referenced by 21 patents and cites 34 patents.

A device, useful for breath analysis and as an amusement device, comprising a flexible tube which can be extended from a shortened condition to an extended condition, one end of the tube being secured to a mouthpiece unit including both an input opening, through which breath can be exhaled into the tube, and an exhaust opening; spring means for urging the tube to its shortened condition; an escape opening at the end of the tube opposite the mouthpiece unit; and pressure regulating means for opening the escape opening when the tube has been inflated by breath exhaled through the input opening. Advantageously, the tube is a collapsible, non-self-supporting polymeric tube and the spring means is effective to roll the tube upon itself in spiral fashion toward the mouthpiece unit.

Title
Method and device for analyzing human breath
Application Number
6/537526
Publication Number
4579826
Application Date
September 30, 1983
Publication Date
April 1, 1986
Inventor
Stephen M Roylance
12210 Glen Mill Rd., Potomac, 20854
MD, US
Craig E Bolton
20400 Frederick Rd., Germantown, 20874
MD, US
IPC
G01N 21/78
G01N 1/22
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