Patent · US Expired

Method of and device for testing a photographic film

US6000861A · kind A · utility

0Cited by

2References

13Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Helmut Zangenfeind · Puchheim, DE
Reinhart Wuerfel · Hersbruck, DE

Key dates

Filing date	Apr 10, 1998
Grant date	Dec 14, 1999
Priority date	—
Expiry date	Apr 10, 2018

Classification

Technology area (CPC G)Physics
CPC primaryG03D13/005
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The invention concerns a method of testing the state of development of a photographic film in a light-proof cartridge. According to the invention, the leading edge of the film is pulled out of the cartridge, the film is positioned between a light source and a photosensor, and the amount of light passing between the light source and photosensor is measured. The state of the film is recognized as being undeveloped if a small amount of light passes therebetween.

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