Signals and indicators – Indicators – Chemically activated type
Reexamination Certificate
2006-09-26
2006-09-26
Fulton, Christopher W. (Department: 2859)
Signals and indicators
Indicators
Chemically activated type
Reexamination Certificate
active
07111580
ABSTRACT:
The disclosure relates to a device for detecting the presence of a chemical contaminant. The device comprising a resilient indicator element which is biased into a first position and is anchored in the first position by means of a failure element. The failure element is made of a material which fails in the presence of a chemical to be detected, thereby releasing the indicator element from its first position and allowing it to move under its own resilience into a second position in order to provide an indication of the presence of the contaminant.
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European Patent Application No. 0 370 685, Beard et al., Pub. date May 30, 1990.
Cohen Amy R.
Fulton Christopher W.
MassTech International Limited
Patterson & Sheridan L.L.P.
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