Closures for containers
US4899898A · kind A · utility
18Cited by
3References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 31, 1988 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Aug 31, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/565
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A container closure molded from plastics material has a top, an annular skirt depending from the top and formed with a screw-threaded on its internal surface, and a tamper-evident ring connected to the bottom edge of the skirt by frangible bridges. The radially inner surface of the ring is formed with wedge-shaped inwardly projecting protrusions for engaging under a security band on the neck of a container. An annular groove is formed on the radially-outer surface of the ring at a location axially between the upper ends of the protrusions and the bridges, and serves to form a hinge in an advantageous method of molding the closure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.