Check valve and compression bag and air cushion bag equipped therewith
US8419278B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 2010 |
| Grant date | Apr 16, 2013 |
| Priority date | — |
| Expiry date | Feb 28, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7879
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A check valve includes two valve films of synthetic resin that put one on the other, and an air passage defined by two seal sections formed by means of bonding parts of the valve films together. A compression bag and air compression bag equipped with this check valve are also provided. An inlet of the air passage is defined by a straight line linking the respective upward flow side end sections of the seal sections. An outlet of the air passage is defined by a straight line linking the respective downward flow side end sections of the seal sections. In at least one of the seal sections, the valve films are not bonded together at the line of extension of the seal section, situated on the downward flow side of the downward flow side end section of the seal section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.