Patent US4888273A successfully refreshed from Google Patents.
US4888273A
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Stabilized tabular silver halide grain emulsions
Assignee: Intellectual Ventures I LLC
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Filing: 1988-02-26
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Granted: 1989-12-19
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Expires: 2008-02-26
Abstract
Abstract Silver halide emulsions containing tabular silver halide grains are stabilized by the employment of a compound of the formula <IMAGE> where R is -SO2NH2, <IMAGE> +TR <IMAGE> In a preferred embodiment an azaindene is also employed.
Inventors
- 👤 Richard S. Himmelwright
- 👤 Avinash C. Mehta
- 👤 Lloyd D. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:39
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
50 words
A method for stabilizing a photosensitive silver halide emulsion comprised of tabular silver halide grains having an aspect ratio of at least 5 which comprises adding to said emulsion during chemical sensitization a compound of the formula ##STR4## and adding to said emulsion an azaindene subsequent to said chemical sensitization.
Claim 2
Independent Claim
50 words
A method for stabilizing a photosensitive silver halide emulsion comprised of tabular silver halide grains having an aspect ratio of at least 5 which comprises adding to said emulsion during chemical sensitization a compound of the formula ##STR4## and adding to said emulsion an azaindene subsequent to said chemical sensitization.
Claim 3
Dependent Claim
9 words
The method of claim 1 wherein R is ##STR5##
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein R is --SO 2 NH 2 .
Claim 5
Dependent Claim
9 words
The method of claim 1 wherein R is --OH.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein said azaindene is an hydroxytetraazaindene.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein said silver halide grains are sensitized to red, green or blue light.
Claim 8
Dependent Claim
19 words
The method of claim 1 wherein said tabular silver halide grains have an aspect ratio of at least 10.
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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) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |