US3615513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibition of silvering in photographic processing solutions
Assignee: Eastman Kodak Co
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Filing: 1969-12-29
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Granted: 1971-10-26
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Expires: 1989-12-29
Abstract
Abstract Orthomercaptobenzoic acid provides good antisludgant action in photographic processing solutions. It is effective in inhibiting silvering or sludging in monobaths, especially in monobaths having high silver halide solvent activity. These include socalled thiosulfate monobaths.
Inventors
- 👤 Grant Milford Haist
- 👤 David Alan Pupo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:42
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C5/00; G03C5/26; G03C5/38; G03C5/383
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
22 words
A monobath as in claim 1 comprising 2 to 10 grams of orthomercaptobenzoic acid per liter of said monobath as said antisludgant.
Claim 2
Dependent Claim
24 words
A monobath as in claim 1 comprising at least 5 grams of a water-soluble thiosulfate per liter of said monobath as said fixing agent.
Claim 3
Dependent Claim
39 words
A monobath as in claim 1 comprising at least 80 grams of sodium thiosulfate per liter of said monobath as said fixing agent and 2 to 10 grams of orthomercaptobenzoic acid per liter of said monobath as said antisludgant.
Claim 4
Dependent Claim
12 words
A monobath as in claim 1 comprising a glutaraldehyde bis(sodium bisulfite) hardener.
Claim 5
Dependent Claim
42 words
A monobath as in claim 1 comprising a 3-pyrazolidone silver halide developing agent, sodium sulfite, at least 5 grams of sodium thiosulfate per liter of said monobath, sodium hydroxide, and 2 to 10 grams of orthomercaptobenzoic acid per liter of said monobath.
Claim 6
Dependent Claim
62 words
A monobath as in claim 1 comprising an aqueous solution containing about 4 grams of 3-pyrazolidone silver halide developing agent, about 12 grams of a hydroquinone silver halide developing agent, about 50 grams of sodium sulfite, about 110 grams of sodium thiosulfate pentahydrate, about 4 grams of sodium hydroxide, and 2 to 10 grams of orthomercaptobenzoic acid per liter of said monobath.
Claim 7
Dependent Claim
43 words
In a photographic method comprising developing and fixing an image in an exposed photographic silver halide element employing a monobath comprising a silver halide developing agent, a thiocyanate or thiosulfate fixing agent and an antisludgant, the improvement wherein said antisludgant is orthomercaptobenzoic acid.
Claim 8
Dependent Claim
23 words
A photographic method as in claim 8 wherein said monobath comprises 2 to 10 grams of orthomercaptobenzoic acid per liter of said monobath.
Claim 9
Dependent Claim
16 words
A photographic method as in claim 8 wherein said monobath comprises a glutaraldehyde bis(sodium bisulfite) hardener.
Claim 10
Dependent Claim
64 words
A photographic method as in claim 8 wherein said monobath comprises about 4 grams of a 3-pyrazolidone silver halide developing agent, about 12 grams of a hydroquinone silver halide developing agent, about 50 grams of sodium sulfite, about 110 grams of sodium thiosulfate pentahydrate, about 4 grams of sodium hydroxide and about 2 to 10 grams of orthomercaptobenzoic acid per liter of said monobath.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |