Container with screw cap
US4253581A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1979 |
| Grant date | Mar 3, 1981 |
| Priority date | — |
| Expiry date | Jan 12, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S215/01
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A container having an external screw thread is closed by a synthetic plastics stopper comprising an internally threaded cap with a seal part protruding from the cap top, this seal part having an outwardly protruding seal section which in use is bent back outwardly by the inner wall of the container neck. The screw thread on the container neck, the screw thread on the cap and the seal section are such in relation to one another that in applying the stopper the seal section contacts the container neck and is bent back thereby before the external screw thread on the container and the internal thread on the cap come into engagement with one another. The seal section preferably consists of permanently deformable material so that on unscrewing the stopper, the seal between the stopper and the container opening is broken before the threads come out of engagement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.