Patent · US Expired

Roll film cassette

US4176938A · kind A · utility

6Cited by

2References

7Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Rudolf Weiss · Vreden, DE
Werner Kiessling · Unterschleißheim, DE
Otto Wiedemann

Key dates

Filing date	Jul 7, 1978
Grant date	Dec 4, 1979
Priority date	—
Expiry date	Jul 7, 1998

Classification

Technology area (CPC G)Physics
CPC primaryG03B17/30
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A roll film cassette has a film storage chamber and a film take-up chamber; these are connected by a web along which the film moves as it travels from the storage chamber to the take-up chamber. The web is provided adjacent the inlet to the take-up chamber with a springy detent a projection of which rides on the film and snaps into a perforation formed adjacent the film end in the film and/or in an end paper of the same. This prevents the film end from slipping into the take-up chamber and becoming inaccessible.

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