US2698236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide transfer product and process
Assignee: Polaroid Corp
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Filing: 1954-05-27
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Granted: 1954-12-28
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Expires: 1974-05-27
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:15
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
252 words
A PHOTOGRAPHIC PRODUCT COMPRISING A PHOTOSENSITIVE ELEMENT INCLUDING A SILVER HALIDE LAYER, A BASE LAYER, AND A REPTURABLE CONTAINING MEANS HOLDING A LIQUID INCLUDING WATER, SAID BASE LAYER HAVING ADJACENT ONE SURFACE THEREOF A DISPERSION OF A SILVER PRECIPITATING AGENT FROM THE CLASS CONSISTING OF THE METAL SULFIDES AND SELENIDES WHICH ARE SUBSTANTIALLY INSOLUBLE IN SAID LIQUID AND A DISPRESION OF AT LEAST ONE METALLIC SALT WHICH IS AT LEAST MODERATELY SOLUBLE AND SUBSTANTIALLY IRREDUCIBLE IN SAID LIQUID, THE LAST-NAMED SALT HAVING AS ITS CATION A METAL WHICH FORMS, WITH THE ANION OF THE SILVER PRECIPITATING AGENT, A SALT WHICH IS SUBSTANTIALLY INSOLUBLE IN SAID LIQUID AND WHICH GIVES IS UP ITS ANIONS TO SILVER IONS BY DISPLACEMENT SAID PRODUCT HAVING POSITIONED THEREIN PHOTOGRAPHIC REAGENTS, INCLUDING A SILVER HALIDE DEVELOPER AND A SILVER HALIDE SOLVENT, SAID CONTAINING MEANS AND SAID LAYERS BEING SO HELD TOGETHER THAT SAID CONTAINING MEANS IS CAPABLE, UPON RUPTURE, OF RELEASING AT LEAST A PART OF ITS CONTENTS TO PERMEATE SUPERPOSED POTIONS OF SAID SILVER HALIDE LAYER AND SAID BASE LAYER, SAID LIQUID, UPON RELEASE, RENDERING SAID SILVER HALIDE DEVELOPER AND SAID SILVER HALIDE SOLVENT EFFECTIVE TO DEVELOP A LATENT IMAGE IN SAID SILVER HALIDE LAYER AND TO FROM SOLUBLE SILVER COMPLEX WITH THE UNDEVELOPED SILVER HALIDE OF SAID SILVER HALIDE LAYER, SAID LIQUID, UPON RELEASE, ADDITIONALLY TRANSPORTING SAID SOLUBLE SILVER COMPLEX IN THE DIRECTION OF SAID SILVER PRECIPITATING AGENT WHEREIN PART AT LEAST OF THE SOLUBLE SILVER COMPLEX IS REDUCED TO SILVER TO PRODUCE THE POSITIVE PRINT.
Claim 2
Dependent Claim
252 words
A PHOTOGRAPHIC PRODUCT COMPRISING A PHOTOSENSITIVE ELEMENT INCLUDING A SILVER HALIDE LAYER, A BASE LAYER, AND A REPTURABLE CONTAINING MEANS HOLDING A LIQUID INCLUDING WATER, SAID BASE LAYER HAVING ADJACENT ONE SURFACE THEREOF A DISPERSION OF A SILVER PRECIPITATING AGENT FROM THE CLASS CONSISTING OF THE METAL SULFIDES AND SELENIDES WHICH ARE SUBSTANTIALLY INSOLUBLE IN SAID LIQUID AND A DISPRESION OF AT LEAST ONE METALLIC SALT WHICH IS AT LEAST MODERATELY SOLUBLE AND SUBSTANTIALLY IRREDUCIBLE IN SAID LIQUID, THE LAST-NAMED SALT HAVING AS ITS CATION A METAL WHICH FORMS, WITH THE ANION OF THE SILVER PRECIPITATING AGENT, A SALT WHICH IS SUBSTANTIALLY INSOLUBLE IN SAID LIQUID AND WHICH GIVES IS UP ITS ANIONS TO SILVER IONS BY DISPLACEMENT SAID PRODUCT HAVING POSITIONED THEREIN PHOTOGRAPHIC REAGENTS, INCLUDING A SILVER HALIDE DEVELOPER AND A SILVER HALIDE SOLVENT, SAID CONTAINING MEANS AND SAID LAYERS BEING SO HELD TOGETHER THAT SAID CONTAINING MEANS IS CAPABLE, UPON RUPTURE, OF RELEASING AT LEAST A PART OF ITS CONTENTS TO PERMEATE SUPERPOSED POTIONS OF SAID SILVER HALIDE LAYER AND SAID BASE LAYER, SAID LIQUID, UPON RELEASE, RENDERING SAID SILVER HALIDE DEVELOPER AND SAID SILVER HALIDE SOLVENT EFFECTIVE TO DEVELOP A LATENT IMAGE IN SAID SILVER HALIDE LAYER AND TO FROM SOLUBLE SILVER COMPLEX WITH THE UNDEVELOPED SILVER HALIDE OF SAID SILVER HALIDE LAYER, SAID LIQUID, UPON RELEASE, ADDITIONALLY TRANSPORTING SAID SOLUBLE SILVER COMPLEX IN THE DIRECTION OF SAID SILVER PRECIPITATING AGENT WHEREIN PART AT LEAST OF THE SOLUBLE SILVER COMPLEX IS REDUCED TO SILVER TO PRODUCE THE POSITIVE PRINT.
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) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |