Tamper-resistant envelope closure
US5584580A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1994 |
| Grant date | Dec 17, 1996 |
| Priority date | — |
| Expiry date | Feb 24, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D33/20
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A tamper-resistance envelope formed of a thermoplastic resin comprises two opposing panels having respective bottom and side wall edges bonded together to form a pocket therebetween. The top of the pocket is open for inserting an item into the pocket. Each panel has an edge portion adjacent the opening. A bead of pressure-sensitive adhesive is applied along each of the edge portions, and the adhesive bead is heat-seal bonded to the thermoplastic edge portion. The edge portions are brought together to bring the adhesive beads into contact to close the opening. By heat-seal bonding the adhesive beads directly to the thermoplastic edge portions, the pressure sensitive adhesive is resistant to being open by supercooling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.