Tamper evident closure
US5088613A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1991 |
| Grant date | Feb 18, 1992 |
| Priority date | — |
| Expiry date | Feb 25, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2401/40
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A tamper evident closure integrally molded in a straight draw mold without slides or cams has a cap skirt, a tamper band radially spaced from the free end of the skirt and extending radially outward, and an anchoring member, spaced radially outward of the tamper band. The tamper band is connected to both the cap skirt and the anchoring member by tearable connections in the form of scored membranes, or preferably, discrete circumferentially spaced radially extending frangible bridges. The tamper band has a circumferentially extending gap and an integral pull tab extending radially outward from one end through a gap in the anchoring member. Preferably, the scored membranes or the frangible bridges between the tamper band and the cap skirt adjacent one end of the tamper band and between the tamper band and the anchoring member at the other end are greater in cross-section than the remainder of the tearable connections so that any attempt to unscrew the closure without tearing out the tamper band results in irreversible distortion and even fracture of the tamper band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.