Bi-directional venting liner
US5730306A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1994 |
| Grant date | Mar 24, 1998 |
| Priority date | — |
| Expiry date | Mar 31, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D51/1622
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A dual cap lining for bi-directional venting comprising a substantially round, disc-shaped, laminated, fluid-impermeable, gas-permeablematerial bottom layer, and having an extruded and cast polyethylene material top layer which is provided with apertures which communicate with the bottom layer and also communicate with channels provided on the upper surface of the top layer, and the material of construction of the laminated bottom layer is gas-permeable such that the dual lining allows bi-directional gas flow therethrough, for gases which have built-up in the interior of the connected container to safely escape by venting from the interior of the container to the external ambient atmosphere through openings existing between the spiral screw threads of the cap closure and threads of the container neck, and the reverse venting to equilibrate for relatively increased external pressure, without passage of solid or liquid material from the interior of the container through the lining to the closure and to the exterior of the container.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.