Railway rolling stock – Special car bodies – Freight
Patent
1997-05-12
1998-08-18
Le, Mark Tuan
Railway rolling stock
Special car bodies
Freight
10537707, 105248, 220371, B61D 3900
Patent
active
057945390
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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Both cone and hatch opening filters for U.S. Patent No. 4,902,173 issued Feb. 20, 1990.
Thin plastic membrane seal referred to in col. 1, lines 37-53 of U.S. Patent No. 4,902,173 issued Feb. 20, 1990.
Hendee Alfred W.
Hendee Charles C.
Ott Michael Anthony
Hendee Enterprises, Inc.
Le Mark Tuan
Salco Products Inc.
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