US4201841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing photographic elements exhibiting differential micro- and macro-area recording characteristics
Assignee: Eastman Kodak Co
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Filing: 1978-07-14
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Granted: 1980-05-06
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Expires: 1998-07-14
Abstract
Abstract Disclosed herein is a process for forming photographic elements particularly useful in both macro- and micro-image reproduction. Such an element comprises a support having thereon one or more silver halide emulsion layers each primarily responsive to an identical portion of the visible spectrum, at least one of the layers containing silver haloiodide grains capable of forming a latent image upon imagewise exposure and a hydrophilic colloid suspending such grains, and at least one of the emulsion layers also having blended therein silver halide grains which are surface fogged as though exposed to imaging radiation of maximum intensity to render them spontaneously developable independent of imagewise exposure of the element.
Inventors
- 👤 Nicholas H. Groet
- 👤 Jacque K. Lindsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:17
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/035; G03C2001/03564; G03C2001/0357
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
183 words
In a process of forming a photographic element capable of forming a micro-image of relatively high contrast and a macro-image of relatively low contrast comprising coating onto a support one or more silver halide emulsion layers, each of the silver halide emulsion layers present in the photographic element being primarily responsive to an identical portion of the visible spectrum upon imagewise exposure of the photographic element, and at least one of the emulsion layers containing silver haloiodide grains capable of forming a latent image upon imagewise exposure and a hydrophilic colloid suspending the grains, the improvement comprising in preparing at least one of the emulsion layers containing silver haloiodide grains, forming a blended silver halide emulsion by interspersing with the hydrophilic colloid suspended latent image-forming silver haloiodide grains additional silver halide grains which are surface fogged as though exposed to imaging radiation of maximum intensity to render them spontaneously developable independent of imagewise exposure of the photographic element, said additional, surface fogged silver halide grains being interspersed in a concentration of 0.1 to 20 percent, based on the total weight of silver halide.
Claim 2
Dependent Claim
183 words
In a process of forming a photographic element capable of forming a micro-image of relatively high contrast and a macro-image of relatively low contrast comprising coating onto a support one or more silver halide emulsion layers, each of the silver halide emulsion layers present in the photographic element being primarily responsive to an identical portion of the visible spectrum upon imagewise exposure of the photographic element, and at least one of the emulsion layers containing silver haloiodide grains capable of forming a latent image upon imagewise exposure and a hydrophilic colloid suspending the grains, the improvement comprising in preparing at least one of the emulsion layers containing silver haloiodide grains, forming a blended silver halide emulsion by interspersing with the hydrophilic colloid suspended latent image-forming silver haloiodide grains additional silver halide grains which are surface fogged as though exposed to imaging radiation of maximum intensity to render them spontaneously developable independent of imagewise exposure of the photographic element, said additional, surface fogged silver halide grains being interspersed in a concentration of 0.1 to 20 percent, based on the total weight of silver halide.
Claim 3
Dependent Claim
23 words
An improved process according to claim 1 wherein the photographic element is formed by coating a single silver halide emulsion onto the support.
Claim 4
Dependent Claim
19 words
An improved process according to claim 1 wherein the one or more silver halide emulsion layers are panchromatically sensitized.
Claim 5
Dependent Claim
30 words
An improved process according to claim 1 wherein the surface fogged silver halide grains are present in an amount sufficient to increase the difference in contrast between micro-image and macro-images.
Claim 6
Dependent Claim
41 words
An improved process according to claim 1 wherein the fogged silver halide grains are present in the one or more silver halide emulsion layers in a concentration of from 0.5 to 10 percent based on the total weight of silver halide.
Claim 7
Dependent Claim
27 words
An improved process according to claim 1 or claim 10 wherein the haloiodide grains are from about 0.5 to 10 mole percent iodide based on total halide.
Claim 8
Dependent Claim
24 words
An improved process according to claim 6 wherein the haloiodide grains are from about 2 to 6 mole percent iodide based on total halide.
Claim 9
Dependent Claim
30 words
An improved process according to claim 1 wherein the surface fogged silver halide grains are before blending relatively monodispersed and have a mean grain diameter less than about 0.4 micron.
Claim 10
Dependent Claim
152 words
In a process of forming a photographic element capable of forming a micro-image of relatively high contrast and a macro-image of relatively low contrast comprising coating onto the support a single panchromatically spectrally sensitized silver halide emulsion layer comprised of a hydrophilic colloid and silver haloiodide grains capable of forming a latent image upon imagewise exposure, the improvement comprising forming the silver halide emulsion by blending with an emulsion containing the silver haloiodide grains and hydrophilic colloid a monodispersed silver halide emulsion comprised of hydrophilic colloid and silver halide grains of less than 0.4 micron in mean diameter which are surface fogged as though exposed to imaging radiation of maximum intensity to render them spontaneously developable independent of imaging exposure of the photographic element, said surface fogged silver halide grains being blended in a concentration of from 0.5 to 10 percent be weight, based on the total weight of the silver halide.
Claim 11
Dependent Claim
152 words
In a process of forming a photographic element capable of forming a micro-image of relatively high contrast and a macro-image of relatively low contrast comprising coating onto the support a single panchromatically spectrally sensitized silver halide emulsion layer comprised of a hydrophilic colloid and silver haloiodide grains capable of forming a latent image upon imagewise exposure, the improvement comprising forming the silver halide emulsion by blending with an emulsion containing the silver haloiodide grains and hydrophilic colloid a monodispersed silver halide emulsion comprised of hydrophilic colloid and silver halide grains of less than 0.4 micron in mean diameter which are surface fogged as though exposed to imaging radiation of maximum intensity to render them spontaneously developable independent of imaging exposure of the photographic element, said surface fogged silver halide grains being blended in a concentration of from 0.5 to 10 percent be weight, based on the total weight of the silver halide.
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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |