Patent EP0362699A2 successfully refreshed from Google Patents.
EP0362699A2
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EP
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Reduced dispersity high aspect ratio tabular grain emulsions
Assignee: Eastman Kodak Co
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Filing: 1989-09-28
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Granted: —
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Expires: 2009-09-28
Abstract
Abstract A high aspect ratio silver bromoiodide tabular grain emulsion is disclosed in which tabular grains having a thickness of less than 0.3 µm account for greater than 50 percent of the projected area of the total grain population and have an average aspect ratio of greater than 12. The coefficient of variation of the total grain population is unusually low when the high average aspect ratio of the tabular grains is taken into account.
Inventors
- 👤 Philip Joseph C/O Eastman Kodak Company Zola
- 👤 Roger Anthony C/O Eastman Kodak Company Bryant
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 22:12
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/0051
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
87 words
A high aspect ratio tabular grain emulsion comprised of a dispersing medium and silver bromoiodide grains, wherein tabular silver bromoiodide grains having a thickness of less than 0.3 µm account for greater than 50 percent of the projected area of the total silver bromoiodide grain population and have an average aspect ratio of greater than 12, characterized in that the quotient of the average silver bromoiodide tabular grain aspect ratio divided by the coefficient of variation of the total silver bromoiodide grain population is greater than 0.7.
Claim 2
Dependent Claim
87 words
A high aspect ratio tabular grain emulsion comprised of a dispersing medium and silver bromoiodide grains, wherein tabular silver bromoiodide grains having a thickness of less than 0.3 µm account for greater than 50 percent of the projected area of the total silver bromoiodide grain population and have an average aspect ratio of greater than 12, characterized in that the quotient of the average silver bromoiodide tabular grain aspect ratio divided by the coefficient of variation of the total silver bromoiodide grain population is greater than 0.7.
Claim 3
Dependent Claim
29 words
An emulsion according to claim 1 further characterized in that the tabular grains having a thickness of less than 0.3 µm have an average aspect ratio at least 20.
Claim 4
Dependent Claim
40 words
An emulsion according to claim 1 or 2 further characterized in that the tabular grains having a thickness of less than 0.3 µm account for greater than 70 percent of the projected area of the total silver bromoiodide grain population.
Claim 5
Dependent Claim
54 words
An emulsion according to any one of claims 1 to 3 inclusive further characterized in that the tabular grains having a thickness of less than 0.2 µm account for greater than 70 percent of the projected area of the total silver bromoiodide grain population and have an average aspect ratio of greater than 12.
Claim 6
Dependent Claim
51 words
An emulsion according to any one of claims 1 to 4 inclusive further characterized in that the quotient of the average silver bromoiodide tabular grain aspect ratio divided by the coefficient of variation of the total silver bromoiodide grain population is in the range of from greater than 0.7 to 2.0.
Claim 7
Dependent Claim
21 words
An emulsion according to claim 5 further characterized in that the quotient is in the range of from 0.8 to 1.5.
Claim 8
Dependent Claim
22 words
An emulsion according to any one of claims 1 to 6 inclusive further characterized in that the dispersing medium is a gelatino-peptizer.
Claim 9
Dependent Claim
21 words
An emulsion according to claim 7 further characterized in that the gelatino-peptizer contains less than 30 micromoles per gram of methionine.
Claim 10
Dependent Claim
52 words
An emulsion according to claim 8 further characterized in that the tabular grains having a thickness of less than 0.07 µm account for greater than 50 percent of the projected area of the total silver bromoiodide grain population and have an average aspect ratio in the range of from 20 to 100.
Claim 11
Dependent Claim
46 words
An emulsion according to claim 9 further characterized in that the the quotient of the average silver bromoiodide tabular grain aspect ratio divided by the coefficient of variation of the total silver bromoiodide grain population is in the range of from greater than 1.0 to 1.5.
References Cited (Backward Citations)
No citation records indexed.
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