Tamperproof closure
US4206851A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1979 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Feb 23, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2401/35
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A thermoplastic tamperproof closure for fitment to a container is disclosed. The container has a threaded neck and an outwardly extending flange beneath the neck threads. The closure features a top wall with an annular sidewall downwardly depending therefrom and having about its inside surface a thread for cooperation with the container thread. Attached to the sidewall by a plurality of spaced apart, non-fracturable ribs is a fracturable band which will fit in a position of intereference under the container flange. This fit is achieved by applying heat to the ribs and band, after the closure is fitted to the container, causing the band and ribs to shrink to the position of interference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.