Patent · US Expired

White safelight handleable photographic film containing a filter dye layer

US5204231A · kind A · utility

0Cited by

8References

28Claims

0Family size

Assignee

Konica Imaging, U.S.A., Inc. · US

Inventors

Elfriede Stockel · Floral Park, US
Thomas R. Smith · Seven Hills, US

Key dates

Filing date	Mar 31, 1992
Grant date	Apr 20, 1993
Priority date	—
Expiry date	Mar 31, 2012

Classification

Technology area (CPC G)Physics
CPC primaryG03C7/3029
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A film containing a filter layer comprised of a combination of a green dye and a yellow dye, which prevents the blue wavelength of white safelight from exposing the film. The filter layer permits handling of the film under white safelight for longer periods of time.

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