Method of thermoforming
US4141771A · kind A · utility
22Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1977 |
| Grant date | Feb 27, 1979 |
| Priority date | — |
| Expiry date | Apr 6, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31928
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of thermoforming a thermo-plastics sheet carrying a protective layer of polyethylene on at least one of the surfaces of the sheet comprising heating the assembly of sheet together with its protective layer to above the softening point of the thermoplastic and subsequently stretching the assembly to a desired shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.