Card or book involving luminescence
US4286399A · kind A · utility
65Cited by
3References
5Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Mar 19, 1980 |
| Grant date | Sep 1, 1981 |
| Priority date | — |
| Expiry date | Mar 19, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D15/022
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
At least one of two openable leaves is provided with at least one light-emitting diode, a thin battery for lighting the diode and a switch assembly. On opening the leaves, the diode emits light, which is extinguished when the leaves are closed to provide an indication of unique interest.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.