US3899336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing composition for diffusion transfer color process containing polyethylene glycol
Assignee: Polaroid Corp
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Filing: 1973-10-26
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Granted: 1975-08-12
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Expires: 1993-10-26
Abstract
Abstract Diffusion transfer film units are disclosed which include a polyethylene glycol. In preferred embodiments, the film units utilize dye developers to form multicolor transfer images. A processing composition containing a polyethylene glycol and adapted for use in performing color diffusion transfer processes is releasably contained in a rupturable container.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:15
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/52; G03C8/32; G03C8/36; G03C8/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
45 words
A RUPTURABLE CONTAINER RELEASABLY HOLDING A PROCESSING COMPOSITION ADAPTED FOR USE IN FORMING DIFFUSION TRANSFER DYE DEVELOPER IMAGES, SAID PROCESSING COMPOSITION COMPRISING AN AQUEOUS ALKALINE SOLUTION OF A FILM-FORMING, VISCOSITY-PROVIDING POLYMER HAVIN A LIGHT-REFLECTING PIGMENT DISPERED THEREIN, SAID COMPOSITION FURTHER INCLUDING A WATER-SOLUBLE POLYETHYLENE GLYCOL.
Claim 2
Dependent Claim
45 words
A RUPTURABLE CONTAINER RELEASABLY HOLDING A PROCESSING COMPOSITION ADAPTED FOR USE IN FORMING DIFFUSION TRANSFER DYE DEVELOPER IMAGES, SAID PROCESSING COMPOSITION COMPRISING AN AQUEOUS ALKALINE SOLUTION OF A FILM-FORMING, VISCOSITY-PROVIDING POLYMER HAVIN A LIGHT-REFLECTING PIGMENT DISPERED THEREIN, SAID COMPOSITION FURTHER INCLUDING A WATER-SOLUBLE POLYETHYLENE GLYCOL.
Claim 3
Dependent Claim
20 words
A rupturable container as defined in claim 1 wherein said polymer is hydroxyethyl cellulose or an alkali metal carboxymethyl cellulose.
Claim 4
Dependent Claim
14 words
A rupturable container as defined in claim 1 wherein said pigment is titanium dioxide.
Claim 5
Dependent Claim
21 words
A rupturable container as defined in claim 1 wherein said polyethylene glycol has a molecular weight of about 6000 to 7500.
Claim 6
Dependent Claim
41 words
A rupturable container as defined in claim 1 wherein said processing composition includes an optical filter agent which is colored at the pH of said processing composition, said optical filter agent being adapted to be rendered colorless by reducing said pH.
Claim 7
Dependent Claim
30 words
A rupturable container as defined in claim 5 wherein the pH of said alkaline solution is in excess of 12, and said alkalinity is provided by an alkali metal hydroxide.
Claim 8
Dependent Claim
28 words
A rupturable container as defined in claim 1 wherein said polyethylene glycol is present in a concentration of about 0.25 to 1.5 percent by weight of said composition.
Claim 9
Dependent Claim
26 words
A rupturable container as defined in claim 7 wherein said concentration of said polyethylene glycol is about 0.5 to 1.0 percent by weight of said composition.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |