Tamper-indicating closures and packages
US4801031A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1987 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | May 28, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D41/3423
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A tamper-indicating closure and package and method of making comprising a one-piece molded closure of plastic which threads onto a container such that when the closure is unthreaded, a tamper-indicating band becomes separated from the lower end of the closure skirt. The tamper-indicating band is joined to the closure along a weakened frangible line. A flexible wall is formed within the band and extends axially toward the base of the closure. The wall has a free edge which has circumferentially flexible spaced flexible wall portions defining pleats or scallops that extend radially inwardly. When the closure is applied to the container, the circumferentially extending wall portions flex radially outwardly over the annular bead on the container and then radially inwardly beneath the annular bead. When the closure is unthreaded, the upper edges of the circumferentially spaced circumferential wall portions engage the underside of the bead and cause the band to sever along the weakened line. The closure is first formed with a portion which extends axially from the closure skirt and this portion is scored to form the weakened line, rolled to form an indentation defining a hinge, pleated t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.