§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0080896A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for the formation of dye image

Assignee: Konica Minolta Inc
•
Filing: 1982-11-30
•
Granted: —
•
Expires: 2002-11-30
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A method of forming a dye image which comprises processing, after imagewise exposure, a silver halide light-sensitive color photographic material having on a support thereof a silver halide emulsion layer containing silver halide crystals of which not less than 80 mol % are silver chloride crystals, in a developer essentially free from bromide ion and having a pH value of not less than 9.5, in the presence of a p-phenylenediamine color developing agent and a compound having an acid dissociation constant of not more than 1 x 10<-><8>, a solubility product with silver ion of not more than 1 x 10<-><1><0> and the formula …<CHEM>… wherein Z represents a group which forms a heterocyclic ring with the N atom.

Inventors

  • 👤 Makoto Kajiwara
  • 👤 Kaoru Onodera

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 18:23
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3022; G03C7/392; G03C7/39208; G03C7/3924; G03C7/39244; G03C7/407; G03C7/413

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 121 words
A method of forming a dye image characterised by processing, after imagewise exposure, a silver halide light-sensitive color photographic material having on a support thereof a silver halide emulsion layer containing silver halide crystals of which not less than 80 mol % are silver chloride crystals, in a developer essentially free from bromide ion and having a pH value of not less than 9.5, in the presence of a p-phenylenediamine color developing agent and a compound having an acid dissociation constant of not more than 1 x 10 -8 , a solubility product with silver ion of not more than 1 x 10 -10 and the formula wherein Z represents a group which forms a heterocyclic ring with the N atom.
Claim 2
Independent Claim 121 words
A method of forming a dye image characterised by processing, after imagewise exposure, a silver halide light-sensitive color photographic material having on a support thereof a silver halide emulsion layer containing silver halide crystals of which not less than 80 mol % are silver chloride crystals, in a developer essentially free from bromide ion and having a pH value of not less than 9.5, in the presence of a p-phenylenediamine color developing agent and a compound having an acid dissociation constant of not more than 1 x 10 -8 , a solubility product with silver ion of not more than 1 x 10 -10 and the formula wherein Z represents a group which forms a heterocyclic ring with the N atom.
Claim 3
Dependent Claim 20 words
A method according to claim 1 wherein said heterocyclic ring is a benzimidazole, benzotriazole, purine, 8-azapurine or pyrazolo pyrimidine ring.
Claim 4
Dependent Claim 16 words
A method according to claim 1 or 2 wherein said compound is incorporated in the developer.
Claim 5
Dependent Claim 25 words
A method according to claim 3 wherein the compound is present in an amount from 1 mg to 10 g per liter of the developer.
Claim 6
Independent Claim 22 words
A method according to any one of claims 1 to 4 wherein the developer has a pH value from 10 to 13.
Claim 7
Independent Claim 21 words
A method according to any one of claims 1 to 5 wherein said silver halide crystals are pure silver chloride crystals.
Claim 8
Independent Claim 22 words
A method according to any one of claims 1 to 6 wherein said silver halide crystals have a mono-dispersed crystal size distribution.
Claim 9
Independent Claim 28 words
A method according to any one of claims 1 to 7 wherein the developer contains from 2 x 10 -3 to 0.2 mole of chloride ions per liter.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag