Illuminated signboard
US5680720A · kind A · utility
12Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1996 |
| Grant date | Oct 28, 1997 |
| Priority date | — |
| Expiry date | Dec 9, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31909
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An illuminated sign board which comprises a film having printing, a frame, and a light source is described. The film is a semi-transparent film made of a stretched resin film containing a finely divided powder of a white inorganic material. The semi-transparent film satisfies the following requirements (1) to (4): PA1 (1) an opacity of from 40% to 70%; PA1 (2) a whiteness of from 80% to 100%; PA1 (3) a total light beam average reflectance of from 30 to 60%; and PA1 (4) a total light beam average transmittance of from 30% to 70%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.