Manhole opening structure
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 31, 1998
Grant Date -
N/A
app pub date -
May 30, 1996
filing date -
Jan 12, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A manhole opening structure having a cover traveling rail on which at least one manhole cover can travel between a manhole opening and the ground and rail lifter serving to upwardly and downwardly move the cover traveling rail between a lower position where the manhole cover closes the manhole opening and an upper position where the manhole cover can move between the cover traveling rail and the ground.
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