Heating foam container in unrestricted state to increase stiffness
US4547412A · kind A · utility
2Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1983 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | Oct 11, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249988
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of improving the stiffness of a polystyrene foam container having a sidewall and a bottom, said container having been prepared from a laminate of polystyrene foam having generally spherical closed cells, and, on at least the outer surface thereof, a layer of solid polystyrene; said method comprising heating said container in the unrestrained state, said heating being sufficient to increase the thickness of the sidewall at least 10%, and cup produced by this method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.