Developer compositions for silver halide photographic materials comprising cyclic amino methane diphosphonic acid compounds

Patent 4873180 Issued on October 10, 1989. Estimated Expiration Date:

April 6, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3201246

Photographic color developer mixture
Patent #: 3994730
Issued on: 11/30/1976
Inventor: Frank , et al.

High contrast continuous tone developer and process of use
Patent #: 4172728
Issued on: 10/30/1979
Inventor: Sincius , et al.

Photographic color developer compositions
Patent #: 4264716
Issued on: 04/28/1981
Inventor: Vincent , et al.

Photographic color developer compositions
Patent #: 4482626
Issued on: 11/13/1984
Inventor: Twist , et al.

Method for processing silver halide color photosensitive materials
Patent #: 4588677
Issued on: 05/13/1986
Inventor: Ishikawa , et al.

Method of processing image-wise exposed silver halide color photographic material
Patent #: 4596764
Issued on: 06/24/1986
Inventor: Ishimaru

Process for high contrast development of photographic elements Patent #: 4693956
Issued on: 09/15/1987
Inventor: Marchesano

Inventors

Application

No. 178251 filed on 04/06/1988

US Classes:

430/491, Sequestrant430/468, Additional developer containing430/480, Heterocyclic developer430/484, Amine developer430/489, Antifoggant430/490, Stabilizer-preservative430/601, Phosphorus compound430/610, Phosphorus compound430/613Heterocyclic compound

Examiners

Primary: Michl, Paul R.
Assistant: Doody, Patrick A.

Attorney, Agent or Firm

Sell; Donald M., Kirn; Walter N., Litman; Mark A.

Foreign Patent References

0136582 EP. 09/22/1983

International Classes

G03C 005/30
G03C 007/16

Foreign Application Priority Data

1987-04-13 IT

Abstract

The addition to an aqueous alkaline developer composition for silver halide photographic materials of a dialkylaminomethane diphosphonic acid compound sequestering agent increases the resistance of the developer composition against aerial oxidation and inhibits calcareous deposit formation.