Hourglass with bypass duct
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United States of America Patent
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-
Jul 17, 2001
Grant Date -
N/A
app pub date -
Jan 27, 2000
filing date -
Jan 27, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An hourglass that includes a mechanism for varying the amount of time measured with the hourglass. The hourglass includes a pair of reservoirs connected a constriction in a conventional manner, and includes a bypass duct that provides fluid communication between the reservoirs.
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