Patent · US Expired

Portable microfilm reader

US4120574A · kind A · utility

4Cited by

3References

6Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Wilfried Hofmann · Munich, DE
Guenther Lueder · Taufkirchen, DE
Walter Rauffer · Munich, DE
John Krueger · Munich, DE
Adolf Koopmann

Key dates

Filing date	Apr 27, 1977
Grant date	Oct 17, 1978
Priority date	—
Expiry date	Apr 27, 1997

Classification

Technology area (CPC G)Physics
CPC primaryG03B21/115
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Portable microfilm reader having a body with a microfilm holder, a projection lamp, a foldable reflecting mirror, a hinged cover, and a projection surface or screen on the inside of the cover. The invention provides means for automatically erecting the mirror when the cover is opened, and automatically folding the mirror when the cover is closed. Means is also provided for automatically turning the projection lamp off when the cover is closed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.