Patent US4059446A successfully refreshed from Google Patents.
US4059446A
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Processing of photographic silver halide material
Assignee: Agfa Gevaert NV
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Filing: 1976-04-12
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Granted: 1977-11-22
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Expires: 1996-04-12
Abstract
Abstract Sludge formation is reduced in the fixing and washing station of an automatic processing apparatus for rapid processing exposed photographic elements, by addition to the fixing and/or washing medium of a compound of the formula: R(OCH.sub.2 CH.sub.2).sub.n OH wherein n is at least 12 and R is an aliphatic group of 6 to 24 carbon atoms or an alkylaryl group.
Inventors
- 👤 Edwin Hendrik Hazenbosch
- 👤 Antoine Roberta Van Rossen
- 👤 Roland Francois Beels
- 👤 Marcel Frans Aelterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:29
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/268; G03C5/29; G03C5/305; G03C5/3056; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
A method of rapid processing of black and white photographic silver halide material in a processing machine of the automatic type wherein the imagewise exposed photographic material is sequentially developed in a hardening developer, fixed in a thiosulphate or thiocyanate fixing solution, washed and dried, characterized in that the fixing medium and/or washing medium contains a polyoxyethylene compound of the formula: R--(OCH.sub.2 CH.sub.2).sub.n OH wherein: n is an integer of at least 12, and R is an aliphatic group containing from 6 to 24 carbon atoms or an alkyl phenyl group comprising C 6 -C 24 carbon atoms in the alkyl chain or alkyl naphthyl comprising C 4 -C 10 carbon atoms in the alkyl chain.
Claim 2
Independent Claim
116 words
A method of rapid processing of black and white photographic silver halide material in a processing machine of the automatic type wherein the imagewise exposed photographic material is sequentially developed in a hardening developer, fixed in a thiosulphate or thiocyanate fixing solution, washed and dried, characterized in that the fixing medium and/or washing medium contains a polyoxyethylene compound of the formula: R--(OCH.sub.2 CH.sub.2).sub.n OH wherein: n is an integer of at least 12, and R is an aliphatic group containing from 6 to 24 carbon atoms or an alkyl phenyl group comprising C 6 -C 24 carbon atoms in the alkyl chain or alkyl naphthyl comprising C 4 -C 10 carbon atoms in the alkyl chain.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein the polyoxyethylene compound is an ethoxylated alkylphenol.
Claim 4
Dependent Claim
25 words
A method according to claim 1, wherein the polyoxyethylene compound is used in an amount from about 0.05 g to about 5 g per liter.
Claim 5
Dependent Claim
16 words
A method according to claim 1, wherein the polyoxyethylene compound is used in the fixing medium.
Claim 6
Dependent Claim
20 words
A method according to claim 1, wherein the hardening developer comprises a dialdehyde hardener or a bisulphite addition product thereof.
Claim 7
Dependent Claim
11 words
Method according to claim 5, wherein the dialdehyde hardener is glutaraldehyde.
Claim 8
Dependent Claim
28 words
A method according to claim 1, wherein the photographic silver halide material is a radiographic silver halide material, comprising at least one silver bromide or silver bromoiodide emulsion.
Claim 9
Dependent Claim
24 words
A method according to claim 1, wherein the polyoxyethylene compound is ethoxylated nonylphenol comprising from about 15 to about 30 recurring ethylene oxide units.
Claim 10
Dependent Claim
13 words
A method according to claim 1, wherein R is a saturated alkyl group.
Claim 11
Dependent Claim
13 words
A method according to claim 1, wherein R is an unsaturated alkyl group.
References Cited (Backward Citations)
US2556540A
Cited
FR1187170A
Cited
US3558313A
Cited
US3667951A
Cited
US3653904A
Cited
US3746543A
Cited
UST879007I4
Cited
UST887022I4
Cited
DE2126416A1
Cited
US3684512A
Cited
US3705800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |