Pressed paperboard servingware with improved rigidity and rim stiffness
US8584929B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 2004 |
| Grant date | Nov 19, 2013 |
| Priority date | — |
| Expiry date | May 2, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2543/00842
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Products and methods of increasing the Rigidity and Rim Stiffness of disposable containers are provided. The containers have an outer flange portion extending outwardly with a brim portion sloping downwardly defining a declivity angle α with respect to a horizontal generally parallel to the bottom portion and generally include an outward turn at the periphery of the container. A preferred method of improving rigidity includes press-forming: (i) a brim transition portion adjoining the downwardly sloping brim portion of the container and (ii) an outwardly extending annular evert portion adjoining the brim transition portion extending outwardly at an eversion angle β of at least about 25 degrees with respect to the downwardly sloping brim portion of the flange.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.