US4497895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing silver halide photographic emulsion
Assignee: Konica Minolta Inc
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Filing: 1982-07-30
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Granted: 1985-02-05
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Expires: 2002-07-30
Abstract
Abstract There is disclosed a method for preparing a silver halide photographic emulsion by use of an ammoniacal silver nitrate solution in a double-jet manner, characterized in that the method comprises the step of maintaining the ratio between the maximum and minimum solubility of the silver halide in a silver halide photographic emulsion at 3 or less after 1/10 of the total amount of the solution containing silver halide has been used. The method according to the present invention provides a monodispersed silver halide photographic emulsion which has a high sensitivity, i.e., which comprises silver halide having a relatively large crystal size.
Inventors
- 👤 Syoji Matsuzaka
- 👤 Takeo Koitabashi
- 👤 Yoshihiro Haga
- 👤 Akio Suzuki
- 👤 Hiroaki Shiozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:18
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; G03C1/035; G03C2001/0357; G03C2001/03594
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
90 words
In a method for preparing a silver halide photographic emulsion by a double-jet process using an ammoniacal silver nitrate solution which forms silver halide, the improvement comprising maintaining the ratio between the maximum and minimum solubility of the silver halide in said silver halide photographic emulsion within the range of up to 3.0 after 1/10 of the total amount of the solution containing silver halide has been used in the process, wherein the solubility of the silver halide is maintained within the range of 1×10 -3 to 1×10 -6 mole/l.
Claim 2
Dependent Claim
90 words
In a method for preparing a silver halide photographic emulsion by a double-jet process using an ammoniacal silver nitrate solution which forms silver halide, the improvement comprising maintaining the ratio between the maximum and minimum solubility of the silver halide in said silver halide photographic emulsion within the range of up to 3.0 after 1/10 of the total amount of the solution containing silver halide has been used in the process, wherein the solubility of the silver halide is maintained within the range of 1×10 -3 to 1×10 -6 mole/l.
Claim 3
Dependent Claim
54 words
The method of claim 1 wherein the maximum and minimum solubility of the silver halide is maintained in the range of up to 3.0 by a method selected from the group consisting of adjusting the pH value, adjusting the pAg value, and adjusting both the pH and pAg values of the silver halide emulsion.
Claim 4
Dependent Claim
40 words
The method of claim 2 wherein the method of maintaining the maximum and minimum solubility of the silver halide comprises adding at least one solution selected from an acid solution and a halide solution to said ammoniacal silver nitrate solution.
Claim 5
Dependent Claim
22 words
The method of claim 2 wherein the pH of said silver halide emulsion is maintained with the range of up to 10.
Claim 6
Dependent Claim
18 words
The method of claim 1 further comprising using a seed emulsion to form said silver halide photographic emulsion.
Claim 7
Dependent Claim
18 words
The method of claim 2 further comprising using a seed emulsion to form said silver halide photographic emulsion.
Claim 8
Dependent Claim
18 words
The method of claim 3 further comprising using a seed emulsion to form said silver halide photographic emulsion.
Claim 9
Dependent Claim
18 words
The method of claim 4 further comprising using a seed emulsion to form said silver halide photographic emulsion.
Claim 10
Dependent Claim
20 words
The method of claim 5 wherein said seed emulsion consists essentially of a seed emulsion which has undergone reduction sensitization.
Claim 11
Dependent Claim
20 words
The method of claim 6 wherein said seed emulsion consists essentially of a seed emulsion which has undergone reduction sensitization.
Claim 12
Dependent Claim
20 words
The method of claim 7 wherein said seed emulsion consists essentially of a seed emulsion which has undergone reduction sensitization.
Claim 13
Dependent Claim
20 words
The method of claim 8 wherein said seed emulsion consists essentially of a seed emulsion which has undergone reduction sensitization.
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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) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |