Device for inscribing additional information on microfilms
US4026644A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1975 |
| Grant date | May 31, 1977 |
| Priority date | — |
| Expiry date | Mar 31, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/243
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A device for inscribing additional informations on microfilms of a construction, wherein informations already recorded on microfilms are projected on an image screen by means of an enlarging and projecting device, additional informations to be entered on this microfilm are written in on the projected enlarged information images on the screen by a pen through guide means which moves on the projected image on the screen, the additional informations thus written-in on an appropriate portion on the projected image on the screen are reduced by a scale reducing means interlinked with the guide means and which reduces the movement of the guide means, and the thus reduced additional informations are then inscribed on the microfilm by means of write-in needle attached to the scale-reducing means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.