US5238780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of image formation
Assignee: Fujifilm Holdings Corp
•
Filing: 1991-09-10
•
Granted: 1993-08-24
•
Expires: 2011-09-10
Abstract
Abstract A method for forming images having a contrast of greater than G 8, comprising the step of developing an imagewise exposed silver halide photographic material with a developing solution having a pH of 11.2 or less. The silver halide photographic material comprises a support having thereon a hydrophilic colloid layer containing a redox compound which releases a development inhibitor upon oxidation and at least one photosensitive silver halide emulsion layer containing a hydrazine derivative. The at least one photosensitive silver halide emulsion layer containing a hydrazine derivative is different from the hydrophilic colloid layer containing a redox compound.
Inventors
- 👤 Yoshihiro Takagi
- 👤 Kazunobu Katoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:46
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/061
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
203 words
A method for forming images having a contrast of greater than G 8 which comprises developing an imagewise exposed silver halide photographic material with a developing solution having a pH of 11.2 or less, said silver halide photographic material comprising a support having thereon a hydrophilic colloid layer containing a redox compound which releases a development inhibitor upon oxidation and at least one photosensitive silver halide emulsion layer containing at least one hydrazine derivative represented by formula (I), and said at least one photosensitive silver halide emulsion layer containing at least one hydrazine derivative represented by formula (I) being different from said hydrophilic colloid layer containing a redox compound: ##STR37## wherein R 1 represents an aliphatic group or an aromatic group; R 2 represents a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group or a hydrazino group; G 1 represents a ##STR38## an --SO 2 group, an --SO-- group, ##STR39## a thiocarbonyl group, or an iminomethylene group; A 1 and A 2 each represents a hydrogen atom, or one of A 1 and A 2 represents a hydrogen atom and the other represents an alkylsulfonyl group, or an arylsulfonyl group, or an acyl group.
Claim 2
Independent Claim
203 words
A method for forming images having a contrast of greater than G 8 which comprises developing an imagewise exposed silver halide photographic material with a developing solution having a pH of 11.2 or less, said silver halide photographic material comprising a support having thereon a hydrophilic colloid layer containing a redox compound which releases a development inhibitor upon oxidation and at least one photosensitive silver halide emulsion layer containing at least one hydrazine derivative represented by formula (I), and said at least one photosensitive silver halide emulsion layer containing at least one hydrazine derivative represented by formula (I) being different from said hydrophilic colloid layer containing a redox compound: ##STR37## wherein R 1 represents an aliphatic group or an aromatic group; R 2 represents a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group or a hydrazino group; G 1 represents a ##STR38## an --SO 2 group, an --SO-- group, ##STR39## a thiocarbonyl group, or an iminomethylene group; A 1 and A 2 each represents a hydrogen atom, or one of A 1 and A 2 represents a hydrogen atom and the other represents an alkylsulfonyl group, or an arylsulfonyl group, or an acyl group.
Claim 3
Dependent Claim
169 words
A method for forming images as in claim 1, wherein said hydrophilic colloid layer or said at least one silver halide emulsion layer contains at least one compound selected from compounds represented by formulae (II) and (III): ##STR40## wherein Y represents a group which adsorbs onto silver halide; X represents a divalent linking group; A represents a divalent linking group; B represents an amino group, an ammonium group or a nitrogen-containing heterocyclic group; m represents 1, 2 or 3; n represents 0 or 1; ##STR41## wherein R 1 and R 2 each represents a hydrogen atom or an aliphatic residue; R 1 and R 2 may be bonded together to form a ring; R 3 represents a divalent aliphatic group; X' represents a divalent 5- or 6-membered heterocyclic group containing a nitrogen atom, an oxygen atom or a sulfur atom; n represents 0 or 1; M represents a hydrogen atom, an alkali metal, an alkaline earth metal, a quaternary ammonium group, a quaternary phosphonium group, or an amidino group.
Claim 4
Dependent Claim
50 words
A method for forming images as in claim 1, wherein the hydrazine derivative represented by formula (I) is contained in the at least one photosensitive silver halide emulsion layer in an amount of from 1×10 -6 to 5×10 -2 mol per mol of silver halide contained in the same layer.
Claim 5
Dependent Claim
50 words
A method for forming images as in claim 1, wherein the hydrazine derivative represented by formula (I) is contained in the at least one photosensitive silver halide emulsion layer in an amount of from 1×10 -5 to 2×10 -2 mol per mol of silver halide contained in the same layer.
Claim 6
Dependent Claim
66 words
A method for forming images as in claim 2, wherein said compound represented by formula (II) is represented by formula (II-a): ##STR42## wherein l represents 0 or 1, m represents 1, 2 or 3, and n represents 0 or 1; [(X n --A--B] m has the same meaning as in formula (II); Q represents an atomic group necessary for forming a 5- or 6-membered heterocyclic ring.
Claim 7
Dependent Claim
35 words
A method for forming images as in claim 2, wherein the compound represented by formulae (II) and (III) is contained in an amount of from 1.0×10 -3 to 0.5 g/m 2 of the photographic material.
Claim 8
Dependent Claim
35 words
A method for forming images as in claim 1, wherein the hydrophilic colloid layer containing the redox compound is arranged above the photosensitive silver halide emulsion layer containing the hydrazine derivative represented by formula (I).
Claim 9
Dependent Claim
26 words
A method for forming images as in claim 1, wherein the photographic material further contains a dye having an absorption peak at 300 to 420 nm.
Claim 10
Dependent Claim
21 words
A method for forming images as in claim 1, wherein the developing solution has a pH of from 11.0 to 9.5.
Claim 11
Dependent Claim
25 words
A method for forming images as in claim 1, wherein the developing solution contains a sulfite salt in an amount of 0.20 mol/liter or more.
References Cited (Backward Citations)
US5139921A
Cited
US5085971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |