US3984249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for sensitizing photosensitive silver halide materials with hydrogen
Assignee: Eastman Kodak Co
•
Filing: 1975-02-04
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Granted: 1976-10-05
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Expires: 1995-02-04
Abstract
Abstract A process is disclosed for increasing the sensitivity of negative-forming radiation sensitive silver halide layers by treating such silver halide layers with hydrogen. The layers thus treated manifest a reduced or substantial absence of reciprocity law failure as well as increased sensitivity to electromagnetic radiation. The products so treated can contain spectral and chemical sensitizers and/or color forming dye-couplers and/or other suitable addenda conventionally employed with photosensitive elements. The products can also exhibit the ability to increase still further in photosensitivity even after imagewise exposure thereof upon prolonged storage of the exposed products under ambient conditions before they are developed.
Inventors
- 👤 Thomas A. Babcock
- 👤 William C. Lewis
- 👤 Thomas H. James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:12
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
69 words
A process for increasing the sensitivity of a solid negative-forming radiation-sensitive gelatino-silver halide emulsion containing layer which process comprises substantially reducing the concentrations of atmospheric gases and moisture in said layer and thereafter treating said layer with a gaseous atmosphere at a pressure of from about 0.5 atmosphere to about 10 atmospheres containing at least about 10 volume percent of hydrogen until the sensitivity of said layer is increased.
Claim 2
Dependent Claim
69 words
A process for increasing the sensitivity of a solid negative-forming radiation-sensitive gelatino-silver halide emulsion containing layer which process comprises substantially reducing the concentrations of atmospheric gases and moisture in said layer and thereafter treating said layer with a gaseous atmosphere at a pressure of from about 0.5 atmosphere to about 10 atmospheres containing at least about 10 volume percent of hydrogen until the sensitivity of said layer is increased.
Claim 3
Dependent Claim
23 words
A process according to claim 1 wherein the concentration of atmospheric gases and moisture is reduced by subjecting said layer to vacuum treatment.
Claim 4
Dependent Claim
22 words
A process according to claim 2 wherein the vacuum is from less than about atmospheric pressure to about 10 - 7 torr.
Claim 5
Dependent Claim
21 words
A process according to claim 1 wherein the hydrogen treatment is performed at from about 0.8 atmospheres to about 1 atmosphere.
Claim 6
Dependent Claim
20 words
A process according to claim 1 wherein the hydrogen treatment is maintained from about 30 seconds to about 3 weeks.
Claim 7
Dependent Claim
20 words
A process according to claim 1 wherein the hydrogen treatment is maintained from about 1 minute to about 24 hours.
Claim 8
Dependent Claim
19 words
A process according to claim 1 wherein the treatment is maintained from about 15 minutes to about 6 hours.
Claim 9
Dependent Claim
23 words
A process according to claim 7 wherein the hydrogen treatment is maintained for 4 hours from about 0.8 atmospheres to about 1 atmosphere.
Claim 10
Dependent Claim
23 words
A process according to claim 3 wherein the vacuum is maintained from about 10 - 3 torr to about 10 - 7 torr.
Claim 11
Dependent Claim
21 words
A process according to claim 1 wherein the hydrogen treatment is performed at a temperature from about 0°C to about 100°C.
Claim 12
Dependent Claim
14 words
A process according to claim 1 wherein said silver halide emulsion is chemically sensitized.
Claim 13
Dependent Claim
14 words
A process according to claim 1 wherein said silver halide emulsion is spectrally sensitized.
Claim 14
Dependent Claim
15 words
A process according to claim 11 wherein said silver halide emulsion is also spectrally sensitized.
Claim 15
Dependent Claim
92 words
A solid negative-forming radiation sensitive silver halide layer treated in accordance with the process of claim 1; said layer having a substantially constant density when exposed to the same quanta of radiation over a range of from 10 0 to about 10 4 seconds and developed, said quanta of radiation being the amount needed to yield a density in the developed silver halide layer of about 0.4 above fog; the sensitivity of said layer being substantially increased by storage for about 30 days after imagewise exposure but before development of said layer.
Claim 16
Dependent Claim
14 words
A radiation sensitive layer according to claim 14 coated on a photographic film support.
Claim 17
Dependent Claim
15 words
A radiation sensitive silver halide emulsion according to claim 14, said emulsion being chemically sensitized.
Claim 18
Dependent Claim
13 words
A radiation sensitive emulsion according to claim 14, said emulsion being spectrally sensitized.
Claim 19
Dependent Claim
14 words
A radiation sensitive emulsion according to claim 16, said emulsion also being spectrally sensitized.
Claim 20
Dependent Claim
17 words
A radiation sensitive emulsion according to claim 16, said emulsion being chemically sensitized with sulfur and gold.
Claim 21
Dependent Claim
17 words
A radiation sensitive emulsion according to claim 16, said emulsion being chemically sensitized with selenium and gold.
Claim 22
Dependent Claim
15 words
A radiation sensitive emulsion according to claim 14 wherein said silver halide is silver bromoiodide.
Claim 23
Dependent Claim
17 words
A radiation sensitive silver halide emulsion according to claim 14 said emulsion containing a photographic color coupler.
Claim 24
Dependent Claim
28 words
A radiation sensitive silver halide emulsion according to claim 22 wherein said photographic color coupler is a phenolic coupler, a 5-pyrazolone coupler or an open chain ketomethylene coupler.
Claim 25
Dependent Claim
22 words
A photographic element comprising a support and a radiation sensitive silver halide layer treated in accordance with the process of claim 1.
Claim 26
Dependent Claim
14 words
A process according to claim 11, said emulsion being sensitized with sulfur and gold.
Claim 27
Dependent Claim
14 words
A process according to claim 11, said emulsion being sensitized with selenium and gold.
Claim 28
Dependent Claim
89 words
A solid photographic element treated in accordance with the process of claim 9; said photographic element comprising at least one negative-forming radiation sensitive silver halide layer coated on a photographic support, said element having substantially no reciprocity failure when exposed to the same quanta of radiation over a range of from about 1 to about 3000 seconds and exhibiting increased sensitivity upon prolonged storage after imagewise exposure but before development, said quanta being that amount of radiation necessary to produce in said element a density of 0.4 above fog.
References Cited (Backward Citations)
US3542557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |