Patent · US Expired

Photographic material containing fogged, direct positive silver halide emulsion and negative silver halide emulsion for the production of equidensities

US3941595A · kind A · utility

5Cited by

7References

10Claims

0Family size

Assignee

AGFA-Gervaert AG · DE

Inventors

Erwin Ranz · Leverkusen, DE
Otto Lapp · Leverkusen, DE
Erik Moisar · Cologne, DE
Harald von Rintelen · Leverkusen, DE

Key dates

Filing date	Nov 20, 1972
Grant date	Mar 2, 1976
Priority date	—
Expiry date	Nov 20, 1992

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S430/141
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Equidensity images can be produced by imagewise exposure and photographic processing of a photographic material containing at least two silver salt emulsions which may be arranged in one layer as a mixture or in two layers, wherein one silver salt emulsion is a fogged direct positive emulsion and the other is a negative emulsion.

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