US4634661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High contrast photographic elements exhibiting stabilized sensitivity
Assignee: Eastman Kodak Co
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Filing: 1985-07-18
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Granted: 1987-01-06
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Expires: 2005-07-18
Abstract
Abstract A negative working photographic element is disclosed capable of producing a high contrast silver image. The photographic element is comprised of surface latent image forming monodispersed silver halide grains having a mean diameter of less than 0.7 μm, a contrast enhancing arylhydrazide, and, in an amount sufficient to stabilize sensitivity, a carboxyalkyl substituted 3H-thiazoline-2-thione.
Inventors
- 👤 Anthony Cavallaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:20
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346; G03C1/061
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
63 words
A negative working photographic element capable of producing a high contrast silver image comprised of a support, a contrast enhancing arylhydrazide, and a gelatino-silver halide emulsion layer comprised of surface latent image forming monodispersed silver halide grains having a mean diameter of less than 0.7 μm, further characterized in that said emulsion layer contains in an amount sufficient to stabilize sensitivity a carboxyalkyl-3H-thiazoline-2-thione.
Claim 2
Dependent Claim
63 words
A negative working photographic element capable of producing a high contrast silver image comprised of a support, a contrast enhancing arylhydrazide, and a gelatino-silver halide emulsion layer comprised of surface latent image forming monodispersed silver halide grains having a mean diameter of less than 0.7 μm, further characterized in that said emulsion layer contains in an amount sufficient to stabilize sensitivity a carboxyalkyl-3H-thiazoline-2-thione.
Claim 3
Dependent Claim
19 words
A photographic element according to claim 1 in which said silver halide grains are of a cubic crystallographic form.
Claim 4
Dependent Claim
23 words
A photographic element according to claim 1 in which said emulsion is a silver bromide emulsion optionally containing a minor proportion of iodide.
Claim 5
Dependent Claim
15 words
A photographic element according to claim 1 in which said silver halide grains are sensitized.
Claim 6
Dependent Claim
24 words
A photographic element according to claim 4 in which said a spectral sensitizing dye is adsorbed to the surface of said silver halide grains.
Claim 7
Dependent Claim
17 words
A photographic element according to claim 4 in which said silver halide grains are surface sulfur sensitized.
Claim 8
Dependent Claim
23 words
A photographic element according to claim 4 in which said silver halide grains contain a Group VIII noble metal as an internal dopant.
Claim 9
Dependent Claim
17 words
A photographic element according to claim 1 in which said emulsion layer additionally contains a latex vehicle.
Claim 10
Dependent Claim
30 words
A photographic element according to claim 1 in which said carboxyalkyl substituent is comprised of a carboxy moiety and an alkylene linking moiety of from 1 to 6 carbon atoms.
Claim 11
Dependent Claim
20 words
A photographic element according to claim 9 in which said alkylene linking moiety contains from 1 to 3 carbon atoms.
Claim 12
Dependent Claim
21 words
A photographic element according to claim 9 in which said alkylene linking moiety is an optionally alkyl substituted methylene linking moiety.
Claim 13
Dependent Claim
19 words
A photographic element according to claim 11 in which said methylene linking moiety is a --CH 2 -- moiety.
Claim 14
Dependent Claim
14 words
A photographic element according to claim 1 in which said emulsion layer contains 4-carboxymethyl-3H-thiazoline-2-thione.
Claim 15
Dependent Claim
29 words
A photographic element according to claim 13 in which said emulsion layer contains said 4-carboxymethyl-3H-thiazoline-2-thione in a concentration of from 3×10 -5 to 3×10 -3 mole per silver mole.
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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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |