Patent US4845023A successfully refreshed from Google Patents.
US4845023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic light-sensitive material
Assignee: Fujifilm Holdings Corp
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Filing: 1987-08-19
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Granted: 1989-07-04
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Expires: 2007-08-19
Abstract
Abstract A silver halide photographic light-sensitive material comprising at least one layer of a silver halide emulsion on a support is improved in shelf stability by treating a chemically sensitized silver halide emulsion with an ion-exchange resin or a porous absorbent to remove residue of the chemical sensitizer during and/or after chemical sensitization.
Inventors
- 👤 Hiroyuki Mifune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:04
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/025; G03C1/06; G03C1/08; G03C1/09; G03C2200/00; G03C2200/04; G03C5/00; G03C5/26; G03C5/264; G03C5/267; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
A process for preparing a chemically sensitized silver halide photographic light-sensitive emulsion, comprising the steps of: forming a silver halide photographic light-sensitive emulsion, adding a chemical sensitizer or chemical sensitization aid to the emulsion, and treating the emulsion with an ion-exchange resin and/or a porous adsorbent during and/or after chemical sensitization to thereby remove at least part of unreacted residue of the chemical sensitizer or chemical sensitization aid which is present in said emulsion.
Claim 2
Dependent Claim
74 words
A process for preparing a chemically sensitized silver halide photographic light-sensitive emulsion, comprising the steps of: forming a silver halide photographic light-sensitive emulsion, adding a chemical sensitizer or chemical sensitization aid to the emulsion, and treating the emulsion with an ion-exchange resin and/or a porous adsorbent during and/or after chemical sensitization to thereby remove at least part of unreacted residue of the chemical sensitizer or chemical sensitization aid which is present in said emulsion.
Claim 3
Dependent Claim
15 words
The process of claim 1, wherein said treatment is carried out during said chemical sensitization.
Claim 4
Dependent Claim
15 words
The process of claim 1, wherein said treatment is carried out after said chemical sensitization.
Claim 5
Dependent Claim
13 words
The process of claim 1, wherein said treatment is with said ion-exchange resin.
Claim 6
Dependent Claim
13 words
The process of claim 1, wherein said treatment is with said porous adsorbent.
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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |