Tamper-evident cap and neck structure
US4844268A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Apr 12, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2401/35
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A plastic cap for a container neck formed with upper and lower external locking beads has a top disk from which depends an upper outer skirt having an upper internal locking bead and a larger diameter lower skirt having a lower internal locking bead. Between the skirt sections is an external outward extending flange which is weakened by a notch cut in its outer corner. The interior of the skirt is formed with an outward extending shoulder at a lower elevation than said external outward extending flange and the lower skirt wall intersects said outward extending shoulder in a circular intersection. A circumferential line of minimum thickness extends downward-inward from said notch to said line of intersection. When the cap is seated on the neck the upper and lower beads interengage, the cap cannot be removed without evidence of tampering. To fracture the flange at the line of minimum thickness, a tear tab depends from the lower edge of the skirt and a curved score line at the upper end of the tear tab extends up from the lower edge of the skirt to the level of the line of minimum thickness. Pulling the tab tears the skirt at the curved score line and around the line of minimum thickn…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.