US3415646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel photographic products and processes
Assignee: Polaroid Corp
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Filing: 1967-05-16
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Granted: 1968-12-10
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Expires: 1987-05-16
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:44
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/44; G03C8/426
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PHOTOGRAPHIC FILM UNIT WHICH IS ADAPTED TO BE PROCESSED BY PASSING SAID UNIT BETWEEN A PAIR OF JUXTAPOSED PRESSURE-APPYING MEMBERS AND WHICH COMPRISES, IN COMBINATION: A PHOTOSENSITIVE ELEMENT COMPRISING A COMPOSITE STRUCTURE CONTAINING, AS ESSENTIAL LAYERS, IN SEQUENCE, A FIRST DIMENSIONALLY STABLE TRANSPARENT LAYER, A PHOTOSENSITVE SILVER HALIDE EMULSION LAYER HAVING ASSOCITED THEREWITH A DYE IMAGE-FORMING MATERIAL WHICH IS SOLUBLE AND DIFFUSIBLE, IN ALKALI, AT A FIRST PH, AN ALKALINE SOLUTION PERMEABLE POLYMERIC LAYER DYEABLE BY SAID DYE-PROVIDING MATERIAL, AN ALKALINE SOLUTION PERMEABLE POLYMERIC ACID LAYER CONTAINING SUFFICIENT ACIDIFYING GROUPS TO EFFECT REDUCTION OF A PROCESSING SOLUTION HAVING SAID FIRST PH TO A SECOND PH AT WHICH SAID DYE IMAGE-PROVIDING MATERIAL IS
Claim 2
Dependent Claim
113 words
A PHOTOGRAPHIC FILM UNIT WHICH IS ADAPTED TO BE PROCESSED BY PASSING SAID UNIT BETWEEN A PAIR OF JUXTAPOSED PRESSURE-APPYING MEMBERS AND WHICH COMPRISES, IN COMBINATION: A PHOTOSENSITIVE ELEMENT COMPRISING A COMPOSITE STRUCTURE CONTAINING, AS ESSENTIAL LAYERS, IN SEQUENCE, A FIRST DIMENSIONALLY STABLE TRANSPARENT LAYER, A PHOTOSENSITVE SILVER HALIDE EMULSION LAYER HAVING ASSOCITED THEREWITH A DYE IMAGE-FORMING MATERIAL WHICH IS SOLUBLE AND DIFFUSIBLE, IN ALKALI, AT A FIRST PH, AN ALKALINE SOLUTION PERMEABLE POLYMERIC LAYER DYEABLE BY SAID DYE-PROVIDING MATERIAL, AN ALKALINE SOLUTION PERMEABLE POLYMERIC ACID LAYER CONTAINING SUFFICIENT ACIDIFYING GROUPS TO EFFECT REDUCTION OF A PROCESSING SOLUTION HAVING SAID FIRST PH TO A SECOND PH AT WHICH SAID DYE IMAGE-PROVIDING MATERIAL IS
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) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |