US4865964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blended emulsions exhibiting improved speed-granularity relationship
Assignee: Eastman Kodak Co
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Filing: 1988-03-25
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Granted: 1989-09-12
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Expires: 2008-03-25
Abstract
Abstract Siliver halide photographic elements are disclosed comprised of blended emulsions. An improved relationship between speed and granularity can be realized when a blended silver bromide or bromoiodide emulsion is comprised of a high aspect ratio tabular grain emulsion containing at least one spectral sensitizing dye and a low aspect ratio grain emulsion.
Inventors
- 👤 Robert J. Newmiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:31
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/0051
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
96 words
A blended emulsion comprised of 10 to 90 percent, based on total silver, of a high aspect ratio tabular grain emulsion containing at least one spectral sensitizing dye and 90 to 10 percent, based on total silver, of a low aspect ratio grain emulsion, said high and low aspect ratio grain emulsions being silver bromide or bromoiodide emulsions and said high and low aspect ratio grain emulsions exhibiting, prior to blending, relative speeds which differ by less than 50 percent, based on the higher speed emulsion, measured at the absorption peak of said spectral sensitizing dye.
Claim 2
Dependent Claim
96 words
A blended emulsion comprised of 10 to 90 percent, based on total silver, of a high aspect ratio tabular grain emulsion containing at least one spectral sensitizing dye and 90 to 10 percent, based on total silver, of a low aspect ratio grain emulsion, said high and low aspect ratio grain emulsions being silver bromide or bromoiodide emulsions and said high and low aspect ratio grain emulsions exhibiting, prior to blending, relative speeds which differ by less than 50 percent, based on the higher speed emulsion, measured at the absorption peak of said spectral sensitizing dye.
Claim 3
Dependent Claim
38 words
A blended emulsion according to claim 1 further characterized in that the high and low aspect ratio grain emulsions exhibit, prior to blending, relative speeds that differ by less than 30 percent, based on the higher speed emulsion.
Claim 4
Dependent Claim
48 words
A blended emulsion according to claim 2 further characterized in that the high and low aspect ratio grain emulsions exhibit, prior to blending, relative speeds that differ by less than 10 percent, based on the higher speed emulsion, measured at the absorption peak of said spectral sensitizing dye.
Claim 5
Dependent Claim
51 words
A blended emulsion according to claim 1 further characterized in that the blended emulsion is comprised of from 25 to 75 percent, based on total silver, of the high aspect ratio tabular grain emulsion and from 75 to 25 percent, based on total silver, of the low aspect ratio grain emulsion.
Claim 6
Dependent Claim
33 words
A blended emulsion according to claim 4 further characterized in that the blended emulsion is comprised of at least 40 percent, based on total silver, of the high aspect ratio tabular grain emulsion.
Claim 7
Dependent Claim
19 words
A blended emulsion according to claim 1 further characterized in that the blended emulsion is a silver bromoiodide emulsion.
Claim 8
Dependent Claim
25 words
A blended emulsion according to claim 6 further characterized in that the high aspect ratio tabular grain emulsion contains a blue absorbing spectral sensitizing dye.
Claim 9
Dependent Claim
25 words
A blended emulsion according to claim 7 further characterized in that the low aspect ratio grain emulsion contains no spectral sensitizing dye prior to blending.
Claim 10
Dependent Claim
23 words
A blended emulsion according to claim 1 further characterized in that the high aspect ratio tabular grain emulsion is substantially optimally spectrally sensitized.
Claim 11
Dependent Claim
86 words
A blended emulsion comprised of 40 to 60 percent, based on total silver, of a high aspect ratio tabular grain silver bromoiodide emulsion containing at least one spectral sensitizing dye and 60 to 40 percent, based on total silver, of a low aspect ratio grain silver bromoiodide emulsion, and said high and low aspect ratio grain emulsions exhibiting, prior to blending, relative speeds which differ by less than 10 percent, based on the higher speed emulsion, measured at the absorption peak of said spectral sensitizing dye.
Claim 12
Dependent Claim
86 words
A blended emulsion comprised of 40 to 60 percent, based on total silver, of a high aspect ratio tabular grain silver bromoiodide emulsion containing at least one spectral sensitizing dye and 60 to 40 percent, based on total silver, of a low aspect ratio grain silver bromoiodide emulsion, and said high and low aspect ratio grain emulsions exhibiting, prior to blending, relative speeds which differ by less than 10 percent, based on the higher speed emulsion, measured at the absorption peak of said spectral sensitizing dye.
Claim 13
Dependent Claim
27 words
A blended emulsion according to claim 10 further characterized in that the spectral sensitizing dye has its peak absorption in the blue region of the visible spectrum.
Claim 14
Dependent Claim
28 words
A blended emulsion according to claim 1 further characterized in that each of said high and low aspect ratio grain emulsions are negative-working surface latent image forming emulsions.
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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) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |