Patent US3679409A successfully refreshed from Google Patents.
US3679409A
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Color diffusion transfer processes and elements for use thereon with incorporated image-forming material impermeable layer
Assignee: Polaroid Corp
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Filing: 1971-06-01
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Granted: 1972-07-25
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Expires: 1991-06-01
Abstract
Abstract DIFFUSION OF UNDESIRABLE IMAGE-FORMING MATERIALS TO THE IMAGE-RECEIVING ELEMENT OF A MULTICOLOR DIFFUSION TRANSFER PHOTOGRAPHIC PRODUCT IS INHIBITED BY INCORPORATING IN SUCH PRODUCT AN IMAGE-FORMING MATERIAL IMPERMEABLE LAYER BETWEEN THE IMAGE-RECEIVING ELEMENT AND THE NEXT ADJACENT SILVER HALIDE EMULSION LAYER SUBSEQUENT TO SUBSTANTIAL IMAGE FORMATION.
Inventors
- 👤 Sheldon A Buckler
- 👤 Terry W Milligan
- 👤 Howard G Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:46
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |