04205043 is referenced by 60 patents and cites 8 patents.

An inexpensive badge for detection of dangerous gases wherein a plurality of paper discs impregnated with a color sensitive gas indicator chemical are mounted in alignment with apertures in a plastic substrate by a pressure sensitive tape backing. The front face of the substrate is covered with a further strip of pressure sensitive tape, which is removed to initiate indication of gas dosage by the detector.

Title
Hazardous atmosphere badge
Application Number
5/902963
Publication Number
4205043
Application Date
May 4, 1978
Publication Date
May 27, 1980
Inventor
Robert M Fristrom
10610 Mantz Rd., Silver Spring, 20403
MD, US
Victor H Esch
10717 Stanmore Dr., Potomac, 20854
MD, US
Agent
Cushman Darby & Cushman
IPC
A62C 39/02
G01N 31/22
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