Two-piece pleated foam cup
US4284226A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1979 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Aug 3, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7132
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A two-piece foam plastic cup is made from a rectangular blank and either a bottom disc or expandible plastic foam beads. The rectangular blank is pleated in triangular transverse pleats having their apices adjacent to the top rim or mouth of the finished cup to form a frusto-conical sidewall blank with a lapped side seam portion. This sidewall blank is placed in a heated mold with either foam plastic beads or a bottom disc and the mold is heated to fuse the pleats, fuse the lapped side seam, and expand the bottom material and sidewall material into a fused unitary cup or container structure having a sidewall of uniform thickness but with visible pleats therein, despite its resulting smooth surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.