They Invented What? (No. 203)
U.S. Pat. No. 4,922,921: Device for testing one’s breath.
1. A device for use in testing one’s breath comprising a face mask adapted to fit over the nose and mouth of a user, having an edge contoured to sealably engage the user’s face under manual pressure, an upper portion of said edge formed to be disposed over the bridge of the user’s nose, a lower portion of said edge formed to be disposed below and adjacent the user’s lower lip, said mask having a nostril region disposed below said upper edge portion in the vicinity of the user’s nostrils, said mask being formed with at least one aperture therethrough between said nostril region and said upper edge portion whereby to provide at least one air escape passageway, and a storage space sump below said lower edge portion with unobstructed direct access from said sump to said nostril region.
2. The device of claim 1 in which said face mask is formed of substantially impervious material.