Image mask for microfiche
US4688911A · kind A · utility
6Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1986 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Jul 31, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/115
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image masking device for a microfilm reader and/or reader-printer is formed to slide longitudinally of a microfiche handler and comprises a thin opaque mask adapted to ride on the film handler adjacent a film to cover the film and define a clear line of demarcation between visible image portions and obscured portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.