US3756815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binder photographic color diffusion transfer units which utilize neutralizing layer comprising a water soluble polymeric acid and a water soluble
Assignee: Polaroid Corp
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Filing: 1971-07-22
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Granted: 1973-09-04
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Expires: 1991-07-22
Abstract
Abstract FILM UNITS FOR FORMING COLOR TRANSFER IMAGES INCLUDING A NEGATIVE COMPONENT COMPRISING AT LEAST ONE LIGHT-SENSITIVE SILVER HALIDE LAYER AND AN ASSOCIATED DYE IMAGE-PROVIDING MATERIAL AND A POSITIVE COMPONENT CONTAINING A DYEABLE STRATUM WHICH FILM UNITS MAY BE DEVELOPED WITH AN AQUEOUS ALKALINE PROCESSING COMPOSITION TO PROVIDE THE COLOR TRANSFER IMAGE, WHEREIN THE FILM UNIT FURTHER CONTAINS A NEUTRALIZING LAYER COMPRISING A WATER-SOLUBLE POLYMERIC ACID AND A WATER-SOLUBLE BINDER. THE NEUTRAL- IZING LAYER IS PREFERABLY ASSOCIATED WITH THE POSITIVE COMPONENT OF THE FILM UNIT.
Inventors
- 👤 H Schlein
- 👤 R Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:09
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/52
Claims Analysis
Total Claims: 0
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |