US3847618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development of photographic silver halide material
Assignee: Agfa Gevaert NV
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Filing: 1973-05-18
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Granted: 1974-11-12
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Expires: 1993-05-18
Abstract
Abstract A method is described of producing high-contrast images by exposure and development of a photographic lith-type silver halide material wherein the lith material incorporates hydroquinone and development occurs by treating the exposed material with an alkaline development activator in the presence of hydroxylamine or a N-mono-substituted hydroxylamine. Processing time is reduced and the processing composition can be used for extended periods of time without replenishment. Favourable dot quality can be obtained.
Inventors
- 👤 E Hofman
- 👤 Bie L De
- 👤 J Berendsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:24
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/262; G03C1/00; G03C1/005; G03C1/06; G03C1/42; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
100 words
A METHOD OF PRODUCING HIGH-CONTRAST IMAGES BY EXPOSURE AND DEVELOPMENT OF A PHOTOGRAPHIC LITH-TYPE SILVER HALIDE MATERIAL COMPRISING A SUPPORT AND A SILVER HALIDE EMULSION LAYER CONTAINING AT LEAST ABOUT 50 MOLE PERCENT OF SILVER CHLORIDE, AT LEAST ABOUT 5 MOLE PERCENT OF SILVER BROMIDE AND FROM 0 TO ABOUT 5 MOLE PERCENT OF SILVER IODIDE, WHEREIN THE SAID PHOTOGRAPHIC LITH-TYPE MATERIAL INCORPORATES HYDROQUINONE AS DEVELOPING AGENT, AND DEVELOPMENT IS EFFECTED BY TREATMENT OF THE EXPOSED MATERIAL WITH AN ALKALINE DEVELPMENT ACTIVATOR IN THE PRESENCE OF HYDROXYLAMINE OR A SALT THEREOF OR OF A N-MONOSUBSTITUTED HYDROXYLAMINE OR A SALT THEREOF.
Claim 2
Independent Claim
100 words
A METHOD OF PRODUCING HIGH-CONTRAST IMAGES BY EXPOSURE AND DEVELOPMENT OF A PHOTOGRAPHIC LITH-TYPE SILVER HALIDE MATERIAL COMPRISING A SUPPORT AND A SILVER HALIDE EMULSION LAYER CONTAINING AT LEAST ABOUT 50 MOLE PERCENT OF SILVER CHLORIDE, AT LEAST ABOUT 5 MOLE PERCENT OF SILVER BROMIDE AND FROM 0 TO ABOUT 5 MOLE PERCENT OF SILVER IODIDE, WHEREIN THE SAID PHOTOGRAPHIC LITH-TYPE MATERIAL INCORPORATES HYDROQUINONE AS DEVELOPING AGENT, AND DEVELOPMENT IS EFFECTED BY TREATMENT OF THE EXPOSED MATERIAL WITH AN ALKALINE DEVELPMENT ACTIVATOR IN THE PRESENCE OF HYDROXYLAMINE OR A SALT THEREOF OR OF A N-MONOSUBSTITUTED HYDROXYLAMINE OR A SALT THEREOF.
Claim 3
Dependent Claim
22 words
Method according to claim 1, wherein a hydrophilic colloid intermediate layer is arranged between the support and the silver halide emulsion layer.
Claim 4
Dependent Claim
29 words
Method according to claim 2, wherein the said hydrophilic colloid intermediate layer has a weight comprised between about 2 g and about 10 g of hydrophilic colloid per sq.m.
Claim 5
Dependent Claim
16 words
Method according to claim 1, wherein hydroquinone is present in the said hydrophilic colloid intermediate layer.
Claim 6
Dependent Claim
19 words
Method according to claim 1, wherein hydroquinone is present in a hydrophilic colloid coating coated over the emulsion layer.
Claim 7
Dependent Claim
28 words
Method according to claim 1, wherein the hydroquinone is present in the lith material in an amount comprised between about 5 millimole and about 25 millimole per sq.m.
Claim 8
Dependent Claim
15 words
Method according to claim 1, wherein the hydroxylamine compound is present in the development activator.
Claim 9
Dependent Claim
25 words
Method according to claim 1 wherein the hydroxylamine used corresponds to the formula: RNHOH wherein R is hydrogen, an alkyl group or an aryl group.
Claim 10
Dependent Claim
30 words
Method according to claim 7, wherein the hydroxylamine compound is present in the alkaline development activator in an amount comprised between about 0.5 g and about 50 g per litre.
Claim 11
Dependent Claim
17 words
Method according to claim 1, wherein the pH of the alkaline development activator is at least 9.
Claim 12
Dependent Claim
17 words
Method according to claim 1, wherein the lith-material and/or the alkaline development activator comprises a polyoxyethylene compound.
Claim 13
Dependent Claim
19 words
Method according to claim 1, wherein the lith-material and/or the alkaline development activator comprises a N-vinyl-2-pyrrolidone polymer or copolymer.
Claim 14
Dependent Claim
14 words
Method according to claim 1, wherein after development the material is fixed and washed.
Claim 15
Dependent Claim
26 words
Method according to claim 1, wherein after development the material is treated with a stabilizing solution comprising an agent converting non-exposed silver halide in light-insensitive complexes.
Claim 16
Dependent Claim
13 words
Method according to claim 14, wherein said agent is potassium or ammonium thiocyanate.
Claim 17
Dependent Claim
18 words
Method according to claim 14, wherein after treatment with the stabilizing solution the material is fixed and washed.
Claim 18
Dependent Claim
64 words
A photographic lith-type silver halide material comprising a support and a silver halide emulsion layer containing at least about 50 mole percent of silver chloride, at least about 5 mole percent of silver bromide and from 0 to about 5 mole percent of silver iodide, wherein said material incorporates hydroquinone and hydroxylamine or a salt thereof or a N-monosubstituted hydroxylamine or a salt thereof.
Claim 19
Dependent Claim
64 words
A photographic lith-type silver halide material comprising a support and a silver halide emulsion layer containing at least about 50 mole percent of silver chloride, at least about 5 mole percent of silver bromide and from 0 to about 5 mole percent of silver iodide, wherein said material incorporates hydroquinone and hydroxylamine or a salt thereof or a N-monosubstituted hydroxylamine or a salt thereof.
Claim 20
Dependent Claim
27 words
A photographic material according to claim 17, wherein said hydroxylamine compound corresponds to the formula: RNHOH wherein R is hydrogen, an alkyl group or an aryl group.
Claim 21
Dependent Claim
40 words
A photographic material according to claim 17, wherein the hydroquinone is located in a hydrophilic colloid intermediate layer arranged between the support and the silver halide emulsion layer and/or a hydrophilic colloid layer coated over the silver halide emulsion layer.
Claim 22
Dependent Claim
27 words
A photographic material according to claim 17, wherein the hydroxylamine compound is present in the said emulsion layer and/or a hydrophilic colloid layer in water-permeable relationship therewith.
Claim 23
Dependent Claim
28 words
A photographic material according to claim 19, wherein said intermediate layer Has a weight comprised between about 2 g and about 10 g of hydrophilic colloid per sq.m.
Claim 24
Dependent Claim
29 words
A photographic material according to claim 17, wherein the hydroquinone is present in the lith-material in an amount comprised between about 5 millimole and about 25 millimole per sq.m.
Claim 25
Dependent Claim
30 words
A photographic material according to claim 17, wherein the hydroxylamine compound is present in the lith-material in an amount comprised between about 50 mg and about 1 g per sq.m.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |