US3620728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiving sheet for diffusion transfer processes
Assignee: Eastman Kodak Co
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Filing: 1969-12-08
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Granted: 1971-11-16
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Expires: 1989-12-08
Abstract
Abstract A receiving sheet for diffusion transfer processes wherein the image-receiving layer contains as the binding agent a mixture of an alkali metal salt of carboxymethyl cellulose and a propylene glycol ether-substituted methyl ether of cellulose and a process for using the receiving sheet. The novel mixture of binders provides an improved positive which effects more rapid imagetransfer, better tone and combines ease of sandwich separation with immediate dry feel.
Inventors
- 👤 David Alan Cottingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:57
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/52; G03C8/56
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
The receiving sheet of claim 1 wherein the image-receiving layer contains a silver precipitating agent.
Claim 2
Dependent Claim
16 words
The receiving sheet of claim 2 wherein the silver precipitating agent is a heavy metal sulfide.
Claim 3
Dependent Claim
14 words
The receiving sheet of claim 3 wherein the heavy metal sulfide is nickel sulfide.
Claim 4
Dependent Claim
18 words
The receiving sheet of claim 1 wherein the alkali metal salt of carboxymethyl cellulose is sodium carboxymethyl cellulose.
Claim 5
Dependent Claim
15 words
The receiving sheet of claim 1 wherein said image-receiving layer contains colloidal silica dispersed therein.
Claim 6
Dependent Claim
11 words
The receiving sheet of claim 1 wherein the support is paper.
Claim 7
Dependent Claim
83 words
A diffusion transfer receiving sheet comprised of a paper support, an image-receiving layer on said support, said image-receiving layer comprising nickel sulfide as a silver precipitating agent and a colloid binding agent composition comprising about 20 to about 50 percent by weight of sodium carboxymethyl cellulose and about 50 to about 80 percent by weight of a propylene glycol ether-substituted methyl ether of cellulose containing about 28 to about 30 percent methoxyl groups and about 7 to 12 percent propylene glycol ether substitution.
Claim 8
Dependent Claim
89 words
A diffusion transfer process comprising contacting a developing exposed emulsion layer containing silver halide in the presence of a silver halide solvent with an image receiving layer comprising a colloid binding agent composition comprised of about 20 to about 50 percent by weight of an alkali metal salt of carboxymethyl cellulose and about 80 to about 50 percent by weight of a propylene glycol ether-substituted methyl ether of cellulose containing about 28 to about 30 percent methoxyl groups and about 7 to about 12 percent propylene glycol ether substitution.
Claim 9
Dependent Claim
19 words
A process of claim 9 in which a viscous aqueous processing solution containing said silver halide solvent is employed.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |