Patent US4040834A successfully refreshed from Google Patents.
US4040834A
Expired / Lapsed
US
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Regeneration of photographic processing solutions
Assignee: Fujifilm Holdings Corp
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Filing: 1976-02-18
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Granted: 1977-08-09
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Expires: 1996-02-18
Abstract
Abstract Image intensifying solutions containing cobalt (III) complex salts can be regenerated through concentration by means of reverse osmosis.
Inventors
- 👤 Haruhiko Iwano
- 👤 Isao Shimamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:09
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3017; G03C7/3018; G03C5/00; G03C5/26; G03C5/395; G03C5/3956; Y; Y10; Y10S; Y10S430/00; Y10S430/137
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
In photographic processing involving image intensification of a photographic element comprising a substrate and at least one layer containing image-wise distributed silver in the presence of a reducing agent by application of a cobalt (III) complex having ligands selected from the group consisting of ammine, nitrite, nitrate, azide, chloride, thiocyanate, isocyanate and H 2 O; a method for reusing the intensifier solution containing the cobalt (III) complex characterized by: subjecting used intensifying solution to reverse osmosis whereby the cobalt (III) complex is concentrated and unfavorable contaminants are removed, and adjusting the pH to about 4 to 10, said solution thereby being regenerated for further intensifying.
Claim 2
Dependent Claim
105 words
In photographic processing involving image intensification of a photographic element comprising a substrate and at least one layer containing image-wise distributed silver in the presence of a reducing agent by application of a cobalt (III) complex having ligands selected from the group consisting of ammine, nitrite, nitrate, azide, chloride, thiocyanate, isocyanate and H 2 O; a method for reusing the intensifier solution containing the cobalt (III) complex characterized by: subjecting used intensifying solution to reverse osmosis whereby the cobalt (III) complex is concentrated and unfavorable contaminants are removed, and adjusting the pH to about 4 to 10, said solution thereby being regenerated for further intensifying.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein additional cobalt (III) complex is added to the solution prior to further intensifying.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein said solution is aerated prior to further intensifying.
Claim 5
Dependent Claim
13 words
The process of claim 1, wherein said reducing agent is a developing agent.
Claim 6
Dependent Claim
27 words
The process of claim 1, wherein said Co (III) complex is composed of Co (III) having a co-ordination number of six, and at least one ammine ligand.
Claim 7
Dependent Claim
27 words
The process of claim 1, wherein said cobalt (III) complex is composed of Co (III) having a co-ordination number of six and at least five ammine ligands.
Claim 8
Dependent Claim
20 words
The process of claim 1, wherein the concentration of said Co (III) complex is about 1 to about 15 g/l.
Claim 9
Dependent Claim
23 words
The process of claim 1, wherein water is added to the regenerated intensifying solution to make the volume equal to the original volume.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |