Patent US4115601A successfully refreshed from Google Patents.
Patent US4912017A successfully refreshed from Google Patents.
US4912017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic materials
Assignee: Fujifilm Corp
•
Filing: 1989-04-14
•
Granted: 1990-03-27
•
Expires: 2009-04-14
Abstract
Abstract An ultra-high contrast silver halide photographic material which is suitable for daylight use and which has at least one silver halide emission layer on a support, wherein the emulsion layer contains cubic silver halide grains having a mean grain size of 0.15 μm or less and containing silver chloride in an amount of 99 mol % or more. The material can contain a rhodium salt or an organic desensitizer for lowering the sensitivity while maintaining the high contrast photographic property thereof.
Inventors
- 👤 Yoshihiro Takagi
- 👤 Shingo Nishiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:17
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/36; G03C1/035; G03C1/061; G03C2001/03517; G03C2001/03594; G03C1/08; G03C1/09; G03C2001/094; G03C1/34; G03C2001/348; G03C2200/00; G03C2200/33; G03C2200/38; G03C2200/40; G03C5/00; G03C5/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
150 words
A method for preparing an emulsion comprising cubic silver halide grains having a mean grain size of 0.15 μm or less and containing silver chloride in an amount of 99 mol % or more, which comprises adding, before, during, or immediately after the grain formation of silver halide but before a desalting step, a compound represented by formula (I) ##STR28## wherein R 1 , R 2 and R 3 each represents a hydrogen atom, an alkyl group, an amino group, a derivative of an alkyl group, a derivative of an amino group, a halogen atom, an aryl group, a derivative of an aryl group or --CONH--R 4 , wherein R 4 represents a hydrogen atom, an alkyl group, an amino group, a derivative of an alkyl group, a derivative of an amino group, a halogen atom, an aryl group or a derivative of an aryl group to inhibit crystal growth.
Claim 2
Independent Claim
150 words
A method for preparing an emulsion comprising cubic silver halide grains having a mean grain size of 0.15 μm or less and containing silver chloride in an amount of 99 mol % or more, which comprises adding, before, during, or immediately after the grain formation of silver halide but before a desalting step, a compound represented by formula (I) ##STR28## wherein R 1 , R 2 and R 3 each represents a hydrogen atom, an alkyl group, an amino group, a derivative of an alkyl group, a derivative of an amino group, a halogen atom, an aryl group, a derivative of an aryl group or --CONH--R 4 , wherein R 4 represents a hydrogen atom, an alkyl group, an amino group, a derivative of an alkyl group, a derivative of an amino group, a halogen atom, an aryl group or a derivative of an aryl group to inhibit crystal growth.
Claim 3
Dependent Claim
29 words
The method as in claim 1, wherein the compound of the formula (I) is added immediately after the grain formation in an amount of from 0.1 to 10 g/mol-Ag.
Claim 4
Dependent Claim
24 words
The method as in claim 1, wherein the potential in the grain formation falls within the range of from +80 mV to 600 mV.
Claim 5
Dependent Claim
27 words
The method as in claim 3, wherein the potential in the nucleus formation of silver halide falls within the range of from +250 mV to +600 mV.
Claim 6
Dependent Claim
18 words
The method as in claim 1, wherein the pH value in the grain formation is 2.0 or more.
Claim 7
Dependent Claim
26 words
The method as in claim 1, wherein desalting is conducted after the grain formation under the condition of a pH value of from 3.2 to 4.8.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |