Patent US4504572A successfully refreshed from Google Patents.
US4504572A
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Gelatin silver halide photographic elements for tanning development
Assignee: 3M Co
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Filing: 1983-08-04
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Granted: 1985-03-12
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Expires: 2003-08-04
Abstract
Abstract Silver halide photographic elements for tanning development including tanning developers, which can diffuse into the gelatin layer containing them, can be improved if they are associated with non-diffusing hydroquinones. In the case where such tanning developer is hydroquinone or a derivative thereof, said elements include such diffusing hydroquinone associated with a hydroquinone derivative non-diffusing in the gelatin layer containing it. Such non-diffusing hydroquinones preferably are hydroquinones substituted with aliphatic chains containing a total of at least twelve carbon atoms and, more preferably, are dispersed in the layer dissolved in a high-boiling organic solvent.
Inventors
- 👤 Marco Beruto
- 👤 Antonio Luzzi
- 👤 Piero Ramello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:11
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/42; G03C5/00; G03C5/26; G03C5/29; G03C5/315; Y; Y10; Y10S; Y10S430/00; Y10S430/162
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
60 words
A photographic element for tanning development which comprises a base having coated thereon at least a substantially unhardened gelatin layer reactively associated with a light-sensitive silver halide emulsion, a photographically inert water-insoluble colored pigment and a tanning developer, characterized in that said element includes in addition to said tanning developer at least one non-diffusing hydroquinone dispersed in said gelatin layer.
Claim 2
Dependent Claim
60 words
A photographic element for tanning development which comprises a base having coated thereon at least a substantially unhardened gelatin layer reactively associated with a light-sensitive silver halide emulsion, a photographically inert water-insoluble colored pigment and a tanning developer, characterized in that said element includes in addition to said tanning developer at least one non-diffusing hydroquinone dispersed in said gelatin layer.
Claim 3
Dependent Claim
45 words
Photographic element for tanning development according to claim 1, which comprises a base having coated thereon two superimposed substantially unhardened gelatin layers, one of which includes a light-sensitive silver halide emulsion layer and a tanning developer and the other a photographically inert water-insoluble colored pigment.
Claim 4
Dependent Claim
34 words
Photographic element for tanning development according to claim 2, wherein the gelatin layer containing the non-diffusing hydroquinones is the gelatin layer comprising the light-sensitive silver halide emulsion coated on the layer comprising the pigment.
Claim 5
Dependent Claim
35 words
Photographic element for tanning development according to claim 2, wherein the gelatin layer containing the non-diffusing hydroquinones is the gelatin layer comprising the photographically inert water-insoluble colored pigment coated on the layer comprising the emulsion.
Claim 6
Dependent Claim
36 words
Photographic element according to claim 1, which comprises a base having coated thereon a single substantially unhardened gelatin layer including a light-sensitive silver halide emulsion layer, a photographically inert water-insoluble colored pigment and a tanning developer.
Claim 7
Dependent Claim
24 words
Photographic element for tanning development according to claim 2 characterized by having a gelatin layer coated as a protective layer including said non-diffusing hydroquinone.
Claim 8
Dependent Claim
27 words
Photographic element for tanning development according to claim 1 wherein the hydroquinone nucleus is substituted with alkyl groups having a total of at least 12 carbon atoms.
Claim 9
Dependent Claim
25 words
Photographic element for tanning development according to claim 3 wherein the quantity of the non-diffusing hydroquinones is between 0.02 to 0.15 grams per square meter.
Claim 10
Dependent Claim
25 words
Photographic element for tanning development according to claim 4 wherein the quantity of the non-diffusing hydroquinones is between 0.1 and 1.0 grams per square meter.
Claim 11
Dependent Claim
24 words
Photographic element for tanning development according to claim 5, characterized by having a gelatin layer coated as a protective layer including said non-diffusing hydroquinone.
Claim 12
Dependent Claim
27 words
Photographic element for tanning development according to claim 2, wherein the hydroquinone nucleus is substituted with alkyl groups having a total of at least 12 carbon atoms.
Claim 13
Dependent Claim
27 words
Photographic element for tanning development according to claim 3, wherein the hydroquinone nucleus is substituted with alkyl groups having a total of at least 12 carbon atoms.
Claim 14
Dependent Claim
27 words
Photographic element for tanning development according to claim 4, wherein the hydroquinone nucleus is substituted with alkyl groups having a total of at least 12 carbon atoms.
Claim 15
Dependent Claim
27 words
Photographic element for tanning development according to claim 5, wherein the hydroquinone nucleus is substituted with alkyl groups having a total of at least 12 carbon atoms.
Claim 16
Dependent Claim
27 words
Photographic element for tanning development according to claim 6, wherein the hydroquinones nucleus is substituted with alkyl groups having as total of at least 12 carbon atoms.
Claim 17
Dependent Claim
25 words
Photographic element for tanning development according to claim 5, wherein the quantity of the non-diffusing hydroquinones is between 0.02 to 0.15 gram per square meter.
Claim 18
Dependent Claim
25 words
Photographic element for tanning development according to claim 6, wherein the quantity of the non-diffusing hydroquinones is between 0.1 and 1.0 gram per square meter.
Claim 19
Dependent Claim
8 words
The element of claim 1 further comprising 1-phenyl-3-pyrazolidone.
Claim 20
Dependent Claim
8 words
The element of claim 7 further comprising 1-phenyl-3-pyrazolidone.
Claim 21
Dependent Claim
8 words
The element of claim 15 further comprising 1-phenyl-3-pyrazolidone.
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) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |