Thermoplastic bellows lid for thermoplastic containers
US4883190A · kind A · utility
7Cited by
9References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 15, 1988 |
| Grant date | Nov 28, 1989 |
| Priority date | — |
| Expiry date | Aug 15, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D79/0087
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The invention is a thermoplastic lid which utilizes a bellows action to prevent paneling in the thermoplastic container to which it is attached. The lid comprises a flange for attachment to the container and a recessed center portion which has a flex area comprising a raised ridge adjacent to the outer ridge of the center portion. The stiffness of the lid and the thickness of the flex area are no greater than the maximum which will allow the center portion of the lid to flex inwardly sufficiently to provide the minimum displacement of head space necessary to prevent paneling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.