Patent US3802883A successfully refreshed from Google Patents.
US3802883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizer for silver halide light-sensitive material
Assignee: Fujifilm Holdings Corp
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Filing: 1971-06-10
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Granted: 1974-04-09
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Expires: 1991-06-10
Abstract
Abstract A stabilizer for photographic silver halide materials, consisting of an acidic aqueous solution containing ammonium thiocyanate, and an aluminum compound, characterized by incorporation therein of (1) a sulfite and (2) an aliphatic aldehyde or aliphatic ketone of one to five carbon atoms.
Inventors
- 👤 K Ohkubo
- 👤 K Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:11
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/39; Y; Y10; Y10S; Y10S430/00; Y10S430/164
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
17 words
The stabilizer as claimed in claim 1 wherein said aliphatic aldehyde is formaldehyde, acetoaldehyde, glyoxal or glutaraldehyde.
Claim 2
Dependent Claim
14 words
The stabilizer as claimed in claim 1 wherein said ketone is acetone or methylethyl-ketone.
Claim 3
Dependent Claim
22 words
The stabilizer as claimed in claim 1 wherein said sulfite is sodium sulfite, sodium bisulfite, potassium sulfite, potassium metabisulfite or ammonium sulfite.
Claim 4
Dependent Claim
13 words
The stabilizer as claimed in claim 1 wherein said stabilizer contains a tartrate.
Claim 5
Dependent Claim
19 words
The stabilizer as claimed in claim 5 wherein said tartrate is sodium tartrate, potassium tartrate or potassium sodium tartrate.
Claim 6
Dependent Claim
21 words
The stabilizer as claimed in claim 5 wherein the amount of said tartrate is 0.1 - 2 g per one liter.
Claim 7
Dependent Claim
15 words
The stabilizer as claimed in claim 1 wherein said stabilizer contains a heterocyclic mercapto compound.
Claim 8
Dependent Claim
25 words
The stabilizer as claimed in claim 8 wherein the amount of said mercapto compound is at least 0.01 percent by weight based on ammonium thiocyanate.
Claim 9
Dependent Claim
18 words
The stabilizer as claimeD in claim 8 wherein said mercapto compound is 2-mercaptoimidazole, 2-mercaptobenzimidazole, 2-mercaptobenzotriazole, 2-amino-5-mercapto-1,3,4-thiadiazole or 1-phenyl-5-mercaptotetrazole.
Claim 10
Independent Claim
119 words
A method for rapidly processing an exposed silver halide photographic emulsion layer containing a developing agent therein which comprises treating the layer with an aqueous alkali solution, and stabilizing it with an acidic aqueous solution containing (1) ammonium thiocyanate, (2) a water-soluble compound containing aluminum selected from the group consisting of potassium alum, aluminum sulfate, and aluminum chloride, (3) a sulfite and (4) an aliphatic aldehyde or aliphatic ketone of one to five carbon atoms, the pH of said acidic aqueous solution ranging from 3-4, said aliphatic aldehyde or ketone being present in an amount sufficient to form an adduct with the sulfite added to the stabilizer and being present in at least an equimolar amount with the sulfite.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |