Moisture barrier, filter seal for hopper rail car hatches
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United States of America Patent
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May 13, 1997
Grant Date -
N/A
app pub date -
Aug 18, 1995
filing date -
Aug 18, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A moisture barrier seal for use on a hopper car hatch opening that does not need to be removed before vacuum unloading of the hopper car due to the use of a grained plastic such as vertically drawn or cast polyethylene which will rupture as soon as the seal is subjected to the pressure differential across the seal created by the application of vacuum to the hopper car. The moisture barrier layer when combined with a filter layer forms a combination moisture barrier and filter seal.
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