Patent US3748129A successfully refreshed from Google Patents.
US3748129A
Expired / Lapsed
US
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Dye image providing materials within diffusion transfer barrier layers
Assignee: Polaroid Corp
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Filing: 1971-12-06
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Granted: 1973-07-24
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Expires: 1991-12-06
Abstract
Abstract DIFFUSION TRANSFER PHOTOGRAPHIC PRODUCTS COMPRISING A SUPPORT CARRYING AT LEAST TWO SELECTIVELY SENSITIZED SILVER HALIDE EMULSION LAYERS EACH HAVING A DYE WHICH IS PREFERABLY A SILVER HALIDE DEVELOPING AGENT OF PREDETERMINED COLOR ASSOCIATED THEREWITH, AT LEAST ONE OF SAID DYES BEING PRESENT AS A DISPERSION IN A LAYER IMMEDIATELY ADJACENT ITS ASSOCIATED SILVER HALIDE EMULSION LAYER SAID DISPERSION MATRIX COMPRISING A POLYMER WHICH IS PERMEABLE TO HYDROXYL ION AND SOLUBLIZED DYE AT A RATE WHICH INSURES SUBSTANTIAL DEVELOPMENT OF EACH DYES ASSOCIATED SILVER HALIDE EMULSION LAYER PRIOR TO CONTACT OF SUCH LAYER WITH SUBSTANTIAL AMOUNTS OF SOLUBILIZED UNASSOCIATED DYE MATERIAL.
Inventors
- 👤 J Avtges
- 👤 L Taylor
- 👤 J Reid
- 👤 H Schlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:53
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08; G03C8/10; G03C8/12; G03C8/14; G03C8/16
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |