Moisture barrier, filter seal for hopper rail car hatches
US5628254A · kind A · utility
4Cited by
28References
12Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Aug 18, 1995 |
| Grant date | May 13, 1997 |
| Priority date | — |
| Expiry date | Aug 18, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D90/36
- WIPO fieldHandling
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.