US4145271A
Expired / Lapsed
US
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Method for regenerating oxidized photographic developers
Assignee: Teijin Ltd
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Filing: 1977-10-03
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Granted: 1979-03-20
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Expires: 1997-10-03
Abstract
Abstract A method for regenerating an oxidized photographic developer, which comprises bringing the oxidized photographic developer into contact with an adsorbent material which has affinity for the oxidation product of the developing agent or its derivatives and is substantially insoluble in the developer, and a method for regenerating an oxidized photographic developer, which comprises subjecting the oxidized developer to a contacting treatment with an adsorbent material which has affinity for the oxidation product of the developing agent or it derivatives and is substantially insoluble in the developer, and to an electrodialysis treatment using ion exchange membranes.
Inventors
- 👤 Yoshinori Nosse
- 👤 Tomoyoshi Ono
- 👤 Hideaki Suzuki
- 👤 Takezo Ono
- 👤 Seiki Iribe
- 👤 Mineo Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:59
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/31
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
52 words
A method for regenerating an oxidized photographic developer, which comprises subjecting the oxidized developer to a contacting treatment with an adsorbent material which has affinity for the oxidation product of the developing agent or its derivatives and is substantially insoluble in the developer, and to an electrodialysis treatment using ion exchange membranes.
Claim 2
Independent Claim
52 words
A method for regenerating an oxidized photographic developer, which comprises subjecting the oxidized developer to a contacting treatment with an adsorbent material which has affinity for the oxidation product of the developing agent or its derivatives and is substantially insoluble in the developer, and to an electrodialysis treatment using ion exchange membranes.
Claim 3
Dependent Claim
58 words
The method of claim 1 wherein the adsorbent material is a material in the form of a powder, granule, fiber or foam which is made of a nitrogen-containing polymeric compound containing at least one nitrogen atom in its main chain or side chains, a polymeric compound containing an epoxy group, a phenolic synthetic resin or a cellulose acetate.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the adsorbent material is activated carbon in the form of a powder, granule or fiber.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the adsorbent material is an anion exchanger in the form of a powder, granule or fiber.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein the electrodialyzing treatment is performed while maintaining the current density at the ion exchange membranes at 0.02 to 1.2 A/dm 2 .
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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |