Inherently deployable warning to alarm of an opening into the top of a sub-grade structure
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United States of America Patent
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Mar 7, 2006
Grant Date -
Jul 7, 2005
app pub date -
Dec 24, 2003
filing date -
Dec 24, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A signal to warn of the open condition of a sub-grade vault whose lid may be open or missing. A spring-loaded placard is held down in the vault by a closed lid and raises above the opening by its own stored energy when the lid is open or missing.
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