US4756996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic processing composition for processing a photosensitive element of the self-developing type
Assignee: Polaroid Corp
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Filing: 1986-11-03
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Granted: 1988-07-12
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Expires: 2006-11-03
Abstract
Abstract A photographic processing composition which comprises an aqueous alkaline solution, a silver halide developing agent and a substantially water-insoluble, cationic polyoxyethylene amine containing 2 or 3 mols of ethylene oxide.
Inventors
- 👤 Frank E. Debruyn, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:43
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/32; G03C8/36; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
30 words
A photographic processing composition which comprises an aqueous alkaline solution, a silver halide developing agent and a substantially water-insoluble, cationic polyoxyethylene amine containing 2 or 3 moles of ethylene oxide.
Claim 2
Dependent Claim
30 words
A photographic processing composition which comprises an aqueous alkaline solution, a silver halide developing agent and a substantially water-insoluble, cationic polyoxyethylene amine containing 2 or 3 moles of ethylene oxide.
Claim 3
Dependent Claim
11 words
The composition of claim 1 which includes a polymeric thickening agent.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein said polyoxyethylene amine is bis(2-hydroxyethylene) cocoamine.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein said polyoxyethylene amine is N,N',N'-tris (2-hydroxyethyl)-N-tallow-1,3-diaminopropane.
Claim 6
Dependent Claim
30 words
The composition of claim 1 wherein said polyoxyethylene amine is present at a range of about 0.25 to about 3.0% by weight, based on the weight of the processing composition.
Claim 7
Dependent Claim
12 words
The composition of claim 1 wherein said developing agent is a phenylenediamine.
Claim 8
Dependent Claim
34 words
An aqueous photographic processing composition which includes lithium hydroxide, a phenylenediamine silver halide developing agent, a polymeric thickening agent, and a substantially water-insoluble, cationic polyoxyethylene amine containing 2 or 3 moles of ethylene oxide.
Claim 9
Dependent Claim
34 words
An aqueous photographic processing composition which includes lithium hydroxide, a phenylenediamine silver halide developing agent, a polymeric thickening agent, and a substantially water-insoluble, cationic polyoxyethylene amine containing 2 or 3 moles of ethylene oxide.
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) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |