Paperboard clamshell carton
US5553772A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1995 |
| Grant date | Sep 10, 1996 |
| Priority date | — |
| Expiry date | Oct 31, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S229/906
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A clamshell type container is formed from a unitary blank of paperboard. The central portion of the crown of the carton is convex upwardly and the crown carries inwardly concave opposite side walls. The four corners of the crown are each provided with triangular gussets to permit slight deformation of the crown both upon stacking of the open cartons and upon closing the crown down onto the lower tray part of the carton. The tray side walls are curved or recessed downwardly so as to form line contact with a respective crown side wall, such contact defining a seal and inhibiting warm air loss when a warm foodstuff is placed in the carton.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.