Patent US4705738A successfully refreshed from Google Patents.
US4705738A
Expired / Lapsed
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Silver halide photographic material for tanning development and process of producing a relief image
Assignee: Tulalip Consultoria Comercial SU
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Filing: 1986-03-11
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Granted: 1987-11-10
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Expires: 2006-03-11
Abstract
Abstract In a silver halide photographic material for tanning development, comprising a support base coated with a substantially unhardened hydrophilic binder layer including a light-sensitive silver halide emulsion reactively associated with a tanning developer and a dispersion of colloidal silver, the tendency of the hydrophilic binder to become water-insoluble during storage can be prevented by adjusting the pAg of the colloidal silver dispersion to values in the range from 6.5 to 9.5 with a 1-phenyl-5-mercaptotetrazole compound before coating.
Inventors
- 👤 Luciano Balestra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:47
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/315; G03C1/00; G03C1/76; G03C1/825; G03C1/8255
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
A process of producing a relief image on a silver halide photographic element for tanning development, which process comprises image-wise exposing said element, developing the exposed element in an alkali activating bath, and thereafter washing off the unhardened areas of the image with water, said photographic element comprising a support base coated with a substantially unhardened gelatin hydrophilic binder layer comprising a light-sensitive silver halide emulsion reactively associated with a tanning developer and a dispersion of collodial silver, characterized in that the pAg of the colloidal silver dispersion has been corrected before coating after washing to a value on the range from 6.5 to 9.5 with a 1-phenyl-5-mercaptotetrazole compound in an amount sufficient to prevent an undesirable hardening of the unhardened gelatin hydrophilic binder over time due to a mutual effect or artisan between the colloidal silver and the unhardened gelatin hydrophilic binder.
Claim 2
Dependent Claim
143 words
A process of producing a relief image on a silver halide photographic element for tanning development, which process comprises image-wise exposing said element, developing the exposed element in an alkali activating bath, and thereafter washing off the unhardened areas of the image with water, said photographic element comprising a support base coated with a substantially unhardened gelatin hydrophilic binder layer comprising a light-sensitive silver halide emulsion reactively associated with a tanning developer and a dispersion of collodial silver, characterized in that the pAg of the colloidal silver dispersion has been corrected before coating after washing to a value on the range from 6.5 to 9.5 with a 1-phenyl-5-mercaptotetrazole compound in an amount sufficient to prevent an undesirable hardening of the unhardened gelatin hydrophilic binder over time due to a mutual effect or artisan between the colloidal silver and the unhardened gelatin hydrophilic binder.
Claim 3
Dependent Claim
112 words
A photographic element for tanning development which comprises a support base having coated thereon at least one substantially unhardened gelatin hydrophilic binder layer comprising a light-sensitive silver halide emulsion reactively associated with a tanning developer and a dispersion of collodial silver, characterized in that the dispersed collodial silver includes a 1-phenyl-5-mercaptotetrazole compound in an amount to have a pAg comprised in the range from 6.5 to 9.5 in an amount comprised between 0.2 and 1 gram per mole of collodial silver sufficient to prevent an undesirable hardening of the unhardened gelatin hydrophilic binder over time due to a mutual effect or action between the colloidal silver and the unhardened gelatin hydrophilic binder.
Claim 4
Dependent Claim
112 words
A photographic element for tanning development which comprises a support base having coated thereon at least one substantially unhardened gelatin hydrophilic binder layer comprising a light-sensitive silver halide emulsion reactively associated with a tanning developer and a dispersion of collodial silver, characterized in that the dispersed collodial silver includes a 1-phenyl-5-mercaptotetrazole compound in an amount to have a pAg comprised in the range from 6.5 to 9.5 in an amount comprised between 0.2 and 1 gram per mole of collodial silver sufficient to prevent an undesirable hardening of the unhardened gelatin hydrophilic binder over time due to a mutual effect or action between the colloidal silver and the unhardened gelatin hydrophilic binder.
Claim 5
Dependent Claim
41 words
The photographic element as claimed in claim 2, which comprises a support base having coated thereon two superimposed substantially unhardened gelatin hydrophilic binder layers, one of which includes the light-sensitive silver halide emulsion and the other the dispersion of colloidal silver.
Claim 6
Dependent Claim
35 words
The photographic element as claimed in claim 3, wherein the unhardened gelatin hydrophilic binder layer including the light-sensitive silver halide emulsion is coated onto the unhardened hydrophilic binder layer including the dispersion of colloidal silver.
Claim 7
Dependent Claim
35 words
The photographic element as claimed in claim 3, wherein the substantially unhardened gelatin hydrophilic binder layer including the colloidal silver dispersion is coated onto the substantially unhardened binder layer including the light-sensitive silver halide emulsion.
Claim 8
Dependent Claim
28 words
The photographic element as claimed in claim 2, wherein a single substantialy unhardened gelatin hydrophilic binder layer includes the light-sensitive silver halide emulsion and the collodial silver dispersion.
Claim 9
Dependent Claim
33 words
The photographic element as claimed in claim 2, wherein the tanning developer is included in the substantially unhardened gelatin hydrophilic binder layer including the light-sensitive silver halide emulsion and/or the colloidal silver dispersion.
Claim 10
Dependent Claim
30 words
The photographic element as claimed in claim 2, which comprises a substantially unhardened gelatin hydrophilic binder layer coated as an outermost protective layer including at least a dispersed nondiffusing hydroquinone.
Claim 11
Dependent Claim
29 words
The photographic element as claimed in claim 2, wherein the silver of said light-sensitive silver halide emulsion is coated at a coverage lower than 0.6 grams per square meter.
Claim 12
Dependent Claim
27 words
The photographic element as claimed in claim 2, wherein the gelatin of said light-sensitive silver halide emulsion layer is coated at a silver-gelatin ratio lower than 0.4.
Claim 13
Dependent Claim
12 words
The photographic element of claim 2, wherein the tanning developer is hydroquinone.
Claim 14
Dependent Claim
18 words
The photographic element of claim 2, wherein the light-sensitive silver halide emulsion is associated with a 3-pyrazolidone compound.
References Cited (Backward Citations)
US3364024A
Cited
US3440049A
Cited
GB1248213A
Cited
US4369245A
Cited
US4448878A
Cited
US4504572A
Cited
US4456676A
Cited
US4544620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |