Cushioning device with improved flexible barrier membrane
US6521305B1 · kind B1 · utility
3Cited by
78References
26Claims
0Family size
Inventors
Key dates
| Filing date | Sep 14, 1999 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Sep 14, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31573
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Products in the form of cushioning devices made from flexible membranes employing at least one layer including thermoplastic urethane and at least one layer of a copolymer of ethylene and vinyl alcohol are inflatable to a relatively high pressure. The cushioning devices maintain the internal inflatant pressure for extended periods of time by employing a phenomenon referred to in the industry as diffusion pumping. Ideally, the cushioning devices of the present invention can be permanently inflated with gases such as nitrogen or air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.