Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
October 16, 2007
Patent Application Number
11176563
Date Filed
July 6, 2005
Patent Primary Examiner
Patent abstract
A warning device that turns on a warning light and or a warning sound to indicate when a manhole cover or a service box cover or a metal pole for lights, traffic lights, transformers or others has become dangerously electrically charged. The invention is attached to the frame of a manhole cover, or a service box cover or a metal pole. The light and sound warns people to stay off the covers and their surrounding areas, and the surrounding areas of the metal poles.
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