Silverless photographic medium and process
US4546071A · kind A · utility
1Cited by
2References
7Claims
0Family size
Inventor
Key dates
| Filing date | Jun 30, 1983 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Jun 30, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/731
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic image was produced by storing a geranium leaf in darkness and then projecting a light image on the leaf for a sufficient time to produce a suitable latent starch image, the leaf then being treated to extract the chlorophyll and then flooded with an iodine solution to stain the starch and develop the photographed image. Alternatively, instead of the leaf, a photographic medium may be employed including a film of a starch free, water, carbon dioxide and light permeable matrix, such as gelatin, having dispersed therein chloroplast containing algae or photosynthetic bacteria.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.