Spectral image viewing device
US4799764A · kind A · utility
8Cited by
1References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1987 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | Dec 23, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A spectral image viewing device incorporates a thin semi-transparent sheet of prismatic polytetrafluoroethylene polymer film, a viewing aperture and an image producing aperture. The device produces a visually perceptible array of spectral images when aligned with a light source. The device can be in the form of an attractive eye-catching desk-top calendar or decoration formed as flattenable pop-up cardboard structures resembling solid polyhedrons having similar polygons as top and bottom supporting panels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.