US4985350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic light-sensitive material
Assignee: Fujifilm Holdings Corp
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Filing: 1990-01-25
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Granted: 1991-01-15
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Expires: 2010-01-25
Abstract
Abstract A silver halide photographic light-sensitive material includes a support having thereon at least one silver halide light-sensitive emulsion layer, characterized in that at least one of a plurality of emulsions contained in the emulsion layer contains tabular grains having a thickness of less than 0.5 μm, a diameter of at least 0.3 μm, and an average ratio of grain diameter to grain thickness of at least 2, the tabular grains occupy at least 50% of the entire projected area of all the grains contained in the emulsion, the surfaces of the grains are chemically sensitized, and a ratio of surface sensitivity to internal sensitivity of the grains is 0.5 to 2.
Inventors
- 👤 Hideo Ikeda
- 👤 Shingo Ishimaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:27
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/0051; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/14; G03C1/16; G03C1/18; G03C1/76; G03C1/7614; G03C1/815; G03C1/8155; G03C1/825; G03C1/8255; G03C2001/0055; G03C2001/7635
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
A silver halide photographic light-sensitive material comprising a support having thereon at least one silver halide light-sensitive emulsion layer, wherein at least one of a plurality of emulsions contained in said emulsion layer contains tabular grains having a thickness of less than 0.5 μm, a diameter of at least 0.3 μm, and an average ratio of grain diameter to grain thickness of at least 2, said tubular grains occupy at least 50% of the entire projected area of all grains contained in said emulsion, the surfaces of said grains are chemically sensitized, and the ratio of surface sensitivity to internal sensitivity of said grains is 0.5 to 2.
Claim 2
Dependent Claim
108 words
A silver halide photographic light-sensitive material comprising a support having thereon at least one silver halide light-sensitive emulsion layer, wherein at least one of a plurality of emulsions contained in said emulsion layer contains tabular grains having a thickness of less than 0.5 μm, a diameter of at least 0.3 μm, and an average ratio of grain diameter to grain thickness of at least 2, said tubular grains occupy at least 50% of the entire projected area of all grains contained in said emulsion, the surfaces of said grains are chemically sensitized, and the ratio of surface sensitivity to internal sensitivity of said grains is 0.5 to 2.
Claim 3
Dependent Claim
27 words
The silver halide photographic light-sensitive material as in claim 1, wherein said tubular grains have a thickness of at least 0.05 μm, but less than 0.5 μm.
Claim 4
Dependent Claim
23 words
The silver halide photographic light-sensitive material as in claim 1, wherein said tabular grains have a thickness of 0.08 μm to 0.3 μm.
Claim 5
Dependent Claim
23 words
The silver halide photographic light-sensitive material as in claim 1, wherein said tabular grains have a diameter of 0.3 μm to 10 μm.
Claim 6
Dependent Claim
23 words
The silver halide photographic light-sensitive material as in claim 1, wherein said tabular grains have a diameter of 0.5 μm to 2.0 μm.
Claim 7
Dependent Claim
28 words
The silver halide photographic light-sensitive material as in claim 1, wherein said tabular grains have an average ratio of grains diameter to grain thickness of 3 to 12.
Claim 8
Dependent Claim
28 words
The silver halide photographic light-sensitive material as in claim 1, wherein said tabular grains have an average ratio of grain diameter to grain thickness of 5 to 10.
Claim 9
Dependent Claim
30 words
The silver halide photographic light-sensitive material as in claim 1, wherein said tabular grains occupy at least 70% of the entire projected area of all grains contained in said emulsion.
References Cited (Backward Citations)
US4665012A
Cited
US4614711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |