Dry process production of archival microform records from hard copy
US3966317A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1974 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Apr 8, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/465
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A dry-process method and apparatus for producing archival microform records from light reflecting hard copy utilize a dry-process mask film strip which is photosensitive to and microimaged by light reflected and reduced or condensed from the hard copy and developed by heat to provide microimaged transparencies therein as the mask film strip is moved to an imaging and developing station. It also utilizes a dry-process microform film which has archival properties and which is sensitive to and microimaged and developed by short pulses of electromagnetic energy above a threshold value applied thereto through the microimaged transparencies of the superimposed mask film strip when it is moved to an image transferring station to provide in the microform film imaged microform records which conform to the transparent microimages in the dry-process mask film strip and, hence, the hard copy and which have achival properties. The microform film is preferably in the form of a microfiche.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.