Tamper or damage indicating members
US5224221A · kind A · utility
Inventors
Key dates
| Filing date | Apr 22, 1991 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Apr 22, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/4864
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The members, which are typically in the form of a bi-layer glove, comprise an inner layer and an outer layer, both being liquid- and air-impermeable. The outer layer is sealed to the inner layer so as to surround a zone of the inner layer which is not sealed to the outer layer. The space between the layers in the above-mentioned zone is free of air, and the outer layer is translucent or transparent in the area overlying that zone and having a contrasting color relative to the color of the inner layer, so as to provide a visual indication (a change in the perceived color) when the outer layer is breached, as a result of tampering, accidental damage or the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.