US4159245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removal of fogging components in photographic processing solution
Assignee: Fujifilm Holdings Corp
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Filing: 1977-08-11
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Granted: 1979-06-26
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Expires: 1997-08-11
Abstract
Abstract A method for removing fogging and/or color mixing components formed in a color developer containing an aromatic primary amine developing agent during the development processing using the color developer which comprises contacting the color developer with an aqueous solution through a continuous fine open-cell porous diaphragm of a hydrophobic material to thereby transfer the fogging and/or color mixing components from the color developer to the aqueous solution.
Inventors
- 👤 Sachio Matsushita
- 👤 Isao Shimamura
- 👤 Hiroyuki Hirai
- 👤 Kazuo Shirasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:56
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/31; B; B01; B01D; B01D61/00; B01D61/24; B01D61/243; B01D71/00; B01D71/06; B01D71/30; B01D71/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
126 words
A method for removing fogging and/or color mixing components formed in a used color developer solution containing an aromatic primary amine color developing agent during development processing of an exposed silver halide color photographic material which comprises contacting the used color developer solution with an aqueous solution through a continuous fine open-cell porous diaphragm having a pore size in the range of 0.1 to 100 microns and a thickness in the range of 0.01 to 5 mm, said diaphragm being comprised of polytetrafluoroethylene or a mixture of higher than about 50% by weight polytetrafluoroethylene and with up to about 50% by weight of polyethylene, polypropylene or polyvinyl chloride to thereby transfer the fogging and/or color mixing components from the color developer solution to the aqueous solution.
Claim 2
Independent Claim
126 words
A method for removing fogging and/or color mixing components formed in a used color developer solution containing an aromatic primary amine color developing agent during development processing of an exposed silver halide color photographic material which comprises contacting the used color developer solution with an aqueous solution through a continuous fine open-cell porous diaphragm having a pore size in the range of 0.1 to 100 microns and a thickness in the range of 0.01 to 5 mm, said diaphragm being comprised of polytetrafluoroethylene or a mixture of higher than about 50% by weight polytetrafluoroethylene and with up to about 50% by weight of polyethylene, polypropylene or polyvinyl chloride to thereby transfer the fogging and/or color mixing components from the color developer solution to the aqueous solution.
Claim 3
Dependent Claim
38 words
The method according to claim 1, wherein the aqueous solution is an aqueous solution comprising water, a mixture of water and an water-soluble organic solvent or an aqueous solution containing at least one acid or a salt thereof.
Claim 4
Dependent Claim
23 words
The method according to claim 1, wherein the aqueous solution is an aqueous solution containing at least one acid or a salt thereof.
Claim 5
Dependent Claim
17 words
The method according to claim 3, wherein the acid is an inorganic acid or an organic acid.
Claim 6
Dependent Claim
40 words
The method according to claim 4, wherein the inorganic acid is hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid or boric acid, and the organic acid is acetic acid, propionic acid, maleic acid, oxalic acid, malic acid or toluenesulfonic acid.
Claim 7
Dependent Claim
18 words
The method according to claim 1, wherein the color developing agent is a p-phenylenediamine derivative color developing agent.
Claim 8
Dependent Claim
16 words
The method of claim 1 wherein the average pore size is about 0.2 to 50 microns.
Claim 9
Dependent Claim
16 words
The method of claim 1 wherein the average pore size is about 0.5 to 10 microns.
Claim 10
Independent Claim
133 words
A method for removing the fogging and/or color mixing components formed in a used color developer solution containing an aromatic primary amine color developing agent, which has been regenerated by removing the halogen ion accumulated in the color developer solution, during color development which comprises contacting the regenerated color developer solution with an aqueous solution through a continuous fine open-cell porous diaphragm having a pore size in the range of 0.1 to 100 microns and thickness in the range of 0.01 to 5 mm, said diaphragm comprised of of polytetrafluoroethylene or a mixture of higher than about 50% by weight polytetrafluoroethylene and with up to about 50% by weight of polyethylene, polypropylene or polyvinyl chloride to thereby transfer the fogging and/or color mixing components from the color developer solution to the aqueous solution.
Claim 11
Independent Claim
133 words
A method for removing the fogging and/or color mixing components formed in a used color developer solution containing an aromatic primary amine color developing agent, which has been regenerated by removing the halogen ion accumulated in the color developer solution, during color development which comprises contacting the regenerated color developer solution with an aqueous solution through a continuous fine open-cell porous diaphragm having a pore size in the range of 0.1 to 100 microns and thickness in the range of 0.01 to 5 mm, said diaphragm comprised of of polytetrafluoroethylene or a mixture of higher than about 50% by weight polytetrafluoroethylene and with up to about 50% by weight of polyethylene, polypropylene or polyvinyl chloride to thereby transfer the fogging and/or color mixing components from the color developer solution to the aqueous solution.
Claim 12
Dependent Claim
16 words
The method of claim 9 wherein the average pore size is about 0.2 to 50 microns.
Claim 13
Dependent Claim
16 words
The method of claim 9 wherein the average pore size is about 0.5 to 10 microns.
References Cited (Backward Citations)
GB709179A
Cited
US3769206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |