Patent · US Expired

Antihalation and filter dyes for photographic materials

US3984246A · kind A · utility

7Cited by

6References

5Claims

0Family size

Assignee

AGFA-Gervaert AG · DE

Inventors

Hans Ohlschlager · Bensberg, DE
Oskar Riester
Franz Moll · Leverkusen, DE

Key dates

Filing date	Nov 4, 1975
Grant date	Oct 5, 1976
Priority date	—
Expiry date	Nov 4, 1995

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S430/131
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Photographic materials containing in at least one photographic layer as antihalation- or filter-dyes mono-, tri- or pentamethineoxonoles of 1-sulfolanyl pyrazolones, which dyes can be easily decolorized and washed out on treatment of the photographic material in photographic processing.

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