Screen for projection television
US4478902A · kind A · utility
10Cited by
2References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1981 |
| Grant date | Oct 23, 1984 |
| Priority date | — |
| Expiry date | Sep 1, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249989
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A screen for projection television set comprising a foamed support and a reflective film adhered to the concave side of the support, said support having the outer layers with a high density such as 0.7 to 1.2 g/cm.sup.3 and the inner portion with a low density so as to make the density of the foamed support as a whole 0.2 to 0.5 g/cm.sup.3, has good projection properties, surface hardness with sufficiently strong support. When said support is foam molded by using a polyurethane having special polyol components, its heat resistance is remarkably increased and can be foam molded at high temperatures without deformation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.