Patent US4735894A successfully refreshed from Google Patents.
US4735894A
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Silver halide photographic emulsion and photographic material containing the same which comprise junction-type silver halide crystal grains
Assignee: Fujifilm Holdings Corp
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Filing: 1986-04-17
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Granted: 1988-04-05
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Expires: 2006-04-17
Abstract
Abstract A silver halide photographic emulsion is described, comprising junction-type silver halide crystal grains composed of cubic, rectanguloid, or tetradecadedral silver halide crystals as a first type of silver halide crystal, having projection-joined to at least one of the six (100) faces of said first type of silver halide crystal a second type of silver halide crystal having a different halogen composition from the halogen composition of the surface of the first type of silver halide crystal. A silver halide photographic material containing the foregoing photographic emulsion is also described.
Inventors
- 👤 Tadashi Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:40
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/035
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
74 words
A silver halide photographic emulsion comprising junction-type silver halide crystal grains composed of cubic, rectanguloid, or tetradecahedral silver halide crystals as a first type of silver halide crystal, having projection-joined to at least one of the six (100) faces of said first type of silver halide crystal a second type of silver halide crystal having a different halogen composition from the halogen composition of the surface of said first type of silver halide crystal.
Claim 2
Dependent Claim
74 words
A silver halide photographic emulsion comprising junction-type silver halide crystal grains composed of cubic, rectanguloid, or tetradecahedral silver halide crystals as a first type of silver halide crystal, having projection-joined to at least one of the six (100) faces of said first type of silver halide crystal a second type of silver halide crystal having a different halogen composition from the halogen composition of the surface of said first type of silver halide crystal.
Claim 3
Dependent Claim
36 words
An emulsion as in claim 1, wherein said second type of silver halide crystal is silver iodobromide having 4 mole% or less of silver iodide or silver chlorobromide having 2 mole% or less of silver iodide.
Claim 4
Dependent Claim
52 words
An emulsion as in claim 1, wherein said emulsion contains 40% or more of junction-type silver halide crystal grains composed of said first type of silver halide crystal having projection-joined to all (100) faces thereof said second type of silver halide crystal, based on the total number of silver halide crystal grains.
Claim 5
Dependent Claim
54 words
An emulsion as in claim 1, wherein said emulsion contains 60% or more of junction-type silver halide crystal grains composed of said first type of silver halide crystal having projection-joined to the 4 or more (100) faces thereof said second type of silver halide crystal, based on the total number of silver halide grains.
Claim 6
Dependent Claim
54 words
An emulsion as in claim 1, wherein said emulsion contains 85% or more of junction-type silver halide crystal grains composed of said first type of silver halide crystal having projection-joined to the 3 or more (100) faces thereof said second type of silver halide crystal, based on the total number of silver halide grains.
Claim 7
Dependent Claim
31 words
An emulsion as in claim 1, wherein the molar ratio of the second type of silver halide crystal to the first type of silver halide crystal is from 0.03/1 to 12/1.
Claim 8
Dependent Claim
98 words
An emulsion as in claim 1, wherein the proportion of silver halide grains having a structure such that the projection-joined silver halide crystals formed on each different (100) face of the first type of silver halide crystal are joined with each other over the edge portion(s) of the first type of silver halide crystal or are joined with each other so that they cover the corner portions of the first type of silver halide crystal or the (111) faces of a tetradecahedral first type of silver halide crystal is not over 80% of the total silver halide grains.
Claim 9
Dependent Claim
25 words
An emulsion as in claim 1, wherein said first type of silver halide crystal is silver iodochlorobromide containing 10 mole% or less of silver iodide.
Claim 10
Dependent Claim
30 words
An emulsion as in claim 1, wherein the first type of silver halide crystal contains 70 mole% or more of silver chloride and 2 mole% or less of silver iodide.
Claim 11
Dependent Claim
87 words
A silver halide photographic material comprising a support having thereon at least one silver halide photographic emulsion layer comprising junction-type silver halide crystal grains composed of cubic, rectanguloid, or tetradecahedral silver halide crystals as a first type of silver halide crystal, having projection-joined to at least one of the six (100) faces of said first type of silver halide crystal a second type of silver halide crystal having a different halogen composition from the halogen composition of the surface of said first type of silver halide crystal.
Claim 12
Dependent Claim
87 words
A silver halide photographic material comprising a support having thereon at least one silver halide photographic emulsion layer comprising junction-type silver halide crystal grains composed of cubic, rectanguloid, or tetradecahedral silver halide crystals as a first type of silver halide crystal, having projection-joined to at least one of the six (100) faces of said first type of silver halide crystal a second type of silver halide crystal having a different halogen composition from the halogen composition of the surface of said first type of silver halide crystal.
Claim 13
Dependent Claim
39 words
A silver halide photographic material as in claim 10, wherein said second type of silver halide crystal is silver iodobromide having 4 mole% or less of silver iodide or silver chlorobromide having 2 mole% or less of silver iodide.
Claim 14
Dependent Claim
59 words
A silver halide photographic material as in claim 10, wherein the silver halide photographic emulsion layer contains 40% or more of junction-type silver halide crystal grains composed of said first type of silver halide crystal having projection-joined to all (100) faces thereof said second type of silver halide crystal, based on the total number of silver halide crystal grains.
Claim 15
Dependent Claim
61 words
A silver halide photographic material as in claim 10, wherein the silver halide photographic emulsion layer contains 60% or more of junction-type silver halide crystal grains composed of said first type of silver halide crystal having projection-joined to the 4 or more (100) faces thereof said second type of silver halide crystal, based on the total number of silver halide grains.
Claim 16
Dependent Claim
61 words
A silver halide photographic material as in claim 10, wherein the silver halide photographic emulsion layer contains 85% or more of junction-type silver halide crystal grains composed of said first type of silver halide crystal having projection-joined to the 3 or more (100) faces thereof said second type of silver halide crystal, based on the total number of silver halide grains.
Claim 17
Dependent Claim
34 words
A silver halide photographic material as in claim 10, wherein the molar ratio of the second type of silver halide crystal to the first type of silver halide crystal is from 0.03/1 to 12/1.
Claim 18
Dependent Claim
101 words
A silver halide photographic material as in claim 10, wherein the proportion of silver halide grains having a structure such that the projection-joined silver halide crystals formed on each different (100) faces of the first type of silver halide crystal are joined with each other over the edge portion(s) of the first type of silver halide crystal or are joined with each other so that they cover the corner portion of the first type of silver halide crystal or the (111) faces of a tetradecahedral first type of silver halide crystal is not over 80% of the total silver halide grains.
Claim 19
Dependent Claim
26 words
A silver halide photographic light-sensitive material as in claim 10, wherein said first type of silver halide crystal contains 10 mole% or less of silver iodide.
Claim 20
Dependent Claim
34 words
A silver halide photographic light-sensitive material as in claim 10, wherein the first type of silver halide crystal contains 70 mole% or more of silver chloride and 2 mole% or less of silver iodide.
References Cited (Backward Citations)
US3885970A
Cited
US4184878A
Cited
US4094684A
Cited
US4496652A
Cited
JPS55149933A
Cited
US4463087A
Cited
US4471050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |