Patent US4042394A successfully refreshed from Google Patents.
US4042394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic dye image stabilization
Assignee: Eastman Kodak Co
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Filing: 1975-02-03
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Granted: 1977-08-16
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Expires: 1995-02-03
Abstract
Abstract A photographic element is disclosed comprised of a support and at least one layer containing a photographic imaging dye or its precursor. The imaging dye is chosen to have an absorption peak below 590 nm. An azomethine dye having an absorption peak above 700 nm is associated with the imaging dye or its precursor within the photographic layer. The azomethine dye reduces the rate of fading of the imaging dye upon exposure to visible light. A process for stabilizing a photographic dye image is also disclosed.
Inventors
- 👤 Wendell F. Smith, Jr.
- 👤 Kenneth L. Eddy
- 👤 Donald P. Harnish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:01
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B23/00; C09B23/16; C09B23/162; C09B23/164; G; G03; G03C; G03C7/00; G03C7/30; G03C7/305; G03C7/30541; G03C7/30547; G03C7/32; G03C7/3225; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
106 words
A method of forming an image having improved stability in a photographic element containing a photosensitive silver halide emulsion layer, comprising associating in the element (i) a photographic coupler capable of reacting with the oxidized form of a pre-selected primary aromatic amine developing agent to form an imaging dye having an absorption peak below 590 nm, and (ii) a photographic coupler capable of reacting with the oxidized form of the pre-selected developing agent to form an azomethine dye having an absorption peak above 700 nm, imagewise exposing the element, developing the element with the pre-selected developing agent to form the imaging dye and the azomethine dye.
Claim 2
Independent Claim
106 words
A method of forming an image having improved stability in a photographic element containing a photosensitive silver halide emulsion layer, comprising associating in the element (i) a photographic coupler capable of reacting with the oxidized form of a pre-selected primary aromatic amine developing agent to form an imaging dye having an absorption peak below 590 nm, and (ii) a photographic coupler capable of reacting with the oxidized form of the pre-selected developing agent to form an azomethine dye having an absorption peak above 700 nm, imagewise exposing the element, developing the element with the pre-selected developing agent to form the imaging dye and the azomethine dye.
Claim 3
Dependent Claim
27 words
A method of forming an image having improved stability according to claim 1, wherein the imaging dye is produced from a photographic coupler containing a 5-pyrazolone moiety.
Claim 4
Dependent Claim
28 words
A method of forming an image having improved stability according to claim 2 wherein the imaging dye is produced from a photographic coupler having the following structure: ##STR12##
Claim 5
Dependent Claim
30 words
A method of forming an image having improved stability according to claim 1 wherein the azomethine dye is produced from a photographic coupler chosen from the class consisting of ##STR13##
Claim 6
Dependent Claim
84 words
In a photographic element comprised of a support and a dye image in at least one layer containing a photographic imaging dye having an absorption peak below 590 nm, wherein said dye image is formed as a result of silver halide development, the improvement comprising an azomethine dye having an absorption peak above 700 nm associated with said imaging dye within said layer in an amount sufficient to reduce the rate of fading of said dye image upon exposure to visible or ultraviolet radiation.
Claim 7
Dependent Claim
84 words
In a photographic element comprised of a support and a dye image in at least one layer containing a photographic imaging dye having an absorption peak below 590 nm, wherein said dye image is formed as a result of silver halide development, the improvement comprising an azomethine dye having an absorption peak above 700 nm associated with said imaging dye within said layer in an amount sufficient to reduce the rate of fading of said dye image upon exposure to visible or ultraviolet radiation.
Claim 8
Dependent Claim
29 words
In a photographic element according to claim 5, the further improvement wherein said azomethine dye has a quenching efficiency in combination with said imaging dye of greater than 2.0.
Claim 9
Dependent Claim
29 words
In a photographic element according to claim 5, the further improvement wherein said azomethine dye has a quenching efficiency in combination with said imaging dye of greater than 5.0.
Claim 10
Dependent Claim
29 words
In a photographic element according to claim 5, the further improvement wherein said azomethine dye has a quenching capacity in combination with said imaging dye of greater than 1.0.
Claim 11
Dependent Claim
29 words
In a photographic element according to claim 8, the further improvement wherein said azomethine dye has a quenching capacity in combination with said imaging dye of greater than 2.0.
Claim 12
Dependent Claim
29 words
In a photographic element according to claim 9, the further improvement wherein said azomethine dye has a quenching capacity in combination with said imaging dye of greater than 10.0.
Claim 13
Dependent Claim
31 words
In a photographic element according to claim 5, the further improvement in which said azomethine dye and said imaging dye are both present in a common dispersing medium within said layer.
Claim 14
Dependent Claim
42 words
In a photographic element according to claim 11, the further improvement wherein said azomethine dye is present within said dispersing medium of said layer in an amount of at least 0.25 micromole of said azomethine dye per gram of said dispersing medium.
Claim 15
Dependent Claim
43 words
In a photographic element according to claim 12, the further improvement wherein said azomethine dye is present within said dispersing medium of said layer in an amount of from 2.5 to 250 micromoles of said azomethine dye per gram of said dispersing medium.
Claim 16
Dependent Claim
30 words
In a photographic element according to claim 5, the further improvement wherein said azomethine dye exhibits an absorption peak in the range of from 700 to 900 nm in wavelength.
Claim 17
Dependent Claim
29 words
In a photographic element according to claim 5, the further improvement wherein said imaging dye is chosen from the class consisting of azine, anthraquinone, azo, azomethine, and formazan dyes.
Claim 18
Dependent Claim
43 words
In a photographic element according to claim 11, the further improvement wherein said imaging dye is present within said dispersing medium of said layer in an amount of from 2.5 to 250 micromoles of said imaging dye per gram of said dispersing medium.
Claim 19
Dependent Claim
43 words
In a photographic element according to claim 16, the further improvement wherein said imaging dye is present within said dispersing medium of said layer in an amount of from 25 to 150 micromoles of said imaging dye per gram of said dispersing medium.
Claim 20
Dependent Claim
19 words
In a photographic element according to claim 5, the further improvement wherein said imaging dye is a magenta dye.
Claim 21
Dependent Claim
19 words
In a photographic element according to claim 11, the further improvement wherein said dispersing medium is a coupler solvent.
Claim 22
Dependent Claim
19 words
In a photographic element according to claim 5, the further improvement wherein said imaging dye is a yellow dye.
Claim 23
Dependent Claim
19 words
In a photographic element according to claim 18, the further improvement wherein said magenta dye contains a 5-pyrazolone moiety.
Claim 24
Dependent Claim
79 words
In a photographic element comprised of a support and at least one layer containing a photographic dye image formed by an azomethine dye having an absorption peak below 590 nm in wavelength, said azomethine dye being located in said layer within a dispersing medium, the improvement comprising an azomethine dye having an absorption peak above 700 nm located within said dispersing medium within said layer in an amount of at least 0.25 micromole per gram of said dispersing medium.
Claim 25
Dependent Claim
79 words
In a photographic element comprised of a support and at least one layer containing a photographic dye image formed by an azomethine dye having an absorption peak below 590 nm in wavelength, said azomethine dye being located in said layer within a dispersing medium, the improvement comprising an azomethine dye having an absorption peak above 700 nm located within said dispersing medium within said layer in an amount of at least 0.25 micromole per gram of said dispersing medium.
Claim 26
Dependent Claim
30 words
In a photographic element according to claim 22, the further improvement wherein said azomethine dye having an absorption peak above 700 nm is chosen from the class consisting of ##STR14##
Claim 27
Dependent Claim
32 words
In a photographic element according to claim 22, the further improvement wherein said azomethine dye having an absorption peak below 590 nm in wavelength is chosen from the class consisting of ##STR15##
Claim 28
Independent Claim
80 words
A method for preserving the appearance upon exposure to visible or ultraviolet radiation of a dye image in a photographic element containing in at least one layer an imaging dye having its absorption peak below 590 nm, wherein said dye image is formed as a result of silver halide development, comprising associating with the imaging dye within said layer, in an amount sufficient to reduce the rate of fading thereof, an azomethine dye having its absorption peak above 700 nm.
Claim 29
Independent Claim
80 words
A method for preserving the appearance upon exposure to visible or ultraviolet radiation of a dye image in a photographic element containing in at least one layer an imaging dye having its absorption peak below 590 nm, wherein said dye image is formed as a result of silver halide development, comprising associating with the imaging dye within said layer, in an amount sufficient to reduce the rate of fading thereof, an azomethine dye having its absorption peak above 700 nm.
Claim 30
Dependent Claim
30 words
A method for preserving the appearance of a dye image in a photographic element according to claim 25 wherein the imaging dye is chosen from the class consisting of ##STR16##
Claim 31
Dependent Claim
37 words
A method for preserving the appearance of a dye image in a photographic element according to claim 25 wherein the azomethine dye having its absorption peak above 700 nm is chosen from the class consisting of ##STR17##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |