US2584029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver transfer product and process, including a lead salt
Assignee: Polaroid Corp
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Filing: 1946-04-13
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Granted: 1952-01-29
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Expires: 1966-04-13
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:34
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
175 words
A PHOTOGRAPHIC PRODUCT COMPRISING A PHOTOGRAPHIC PRODUCT COMPRISING A PHOTOSENSITIVE MATERIAL WHICH INCLUDES A SILVER HALIDE LAYER, A BASE LAYER FOR RECEIVING, BY TRANSFER, A POSITIVE PRINT, AND A RUPTURABLE CONTAINING MEANS HOLDING A LIQUID, SAID PRODUCT HAVING POSITIONED THEREIN PHOTOGRAPHIC REAGENTS INCLUDING A SILVER HALIDE DEVELOPER, A SILVER HALIDE SOLVENT AND A LEAD SALT SOLUBLE IN SAID LIQUID, SAID CONTAINING MEANS AND SAID LAYERS BEING SO HELD TOGETHER THAT SAID CONTAINING MEANS IS CAPABLE, UPON RUPTURE, OF RELEASING AT LEAST PART OF ITS CONTENTS TO PERMEATE SUPERPOSED PORTIONS OF SAID PHOTOSENSITIVE 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 PHOTOSENSITIVE LAYER AND TO FORM SOLUBLE SILVER COMPLEX WITH THE UNDEVELOPED SILVER HALIDE OF SAID PHOTOSENSITIVE LAYER AND, ADDITIONALLY, PROVIDING A SOLUTION OF THE LEAD SALT ADJACENT THE SURFACE OF THE PRINT-RECEIVING AREA OF SAID BASE LAYER IN WHICH PART AT LEAST OF THE SOLUBLE SILVER COMPLEX IS REDUCED TO SILVER TO PRODUCE THE POSITIVE PRINT.
Claim 2
Dependent Claim
175 words
A PHOTOGRAPHIC PRODUCT COMPRISING A PHOTOGRAPHIC PRODUCT COMPRISING A PHOTOSENSITIVE MATERIAL WHICH INCLUDES A SILVER HALIDE LAYER, A BASE LAYER FOR RECEIVING, BY TRANSFER, A POSITIVE PRINT, AND A RUPTURABLE CONTAINING MEANS HOLDING A LIQUID, SAID PRODUCT HAVING POSITIONED THEREIN PHOTOGRAPHIC REAGENTS INCLUDING A SILVER HALIDE DEVELOPER, A SILVER HALIDE SOLVENT AND A LEAD SALT SOLUBLE IN SAID LIQUID, SAID CONTAINING MEANS AND SAID LAYERS BEING SO HELD TOGETHER THAT SAID CONTAINING MEANS IS CAPABLE, UPON RUPTURE, OF RELEASING AT LEAST PART OF ITS CONTENTS TO PERMEATE SUPERPOSED PORTIONS OF SAID PHOTOSENSITIVE 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 PHOTOSENSITIVE LAYER AND TO FORM SOLUBLE SILVER COMPLEX WITH THE UNDEVELOPED SILVER HALIDE OF SAID PHOTOSENSITIVE LAYER AND, ADDITIONALLY, PROVIDING A SOLUTION OF THE LEAD SALT ADJACENT THE SURFACE OF THE PRINT-RECEIVING AREA OF SAID BASE LAYER IN WHICH PART AT LEAST OF THE SOLUBLE SILVER COMPLEX IS REDUCED TO SILVER TO PRODUCE THE POSITIVE PRINT.
Claim 3
Dependent Claim
143 words
THE PROCESS OF FORMING POSITIVE IMAGES IN SILVER WHICH COMPRISES DEVELOPING A LATENT NEGATIVE IMAGE IN A SILVER HALIDE EMULSION LAYER WITH A SOLUTION COMPRISING A SILVER HALIDE DEVELOPER AND A SILVER HALIDE SOLVENT TO FORM AN IMAGEWISE DISTRIBUTION OF SOL,UBLE SILVER COMPLEX IN SAID EMULSION LAYER, TRANSFERRING FROM SAID EMULSION LAYER BY IMBIBITION AT LEAST PART OF SAID IMAGEWISE DISTRIBUTION OF SAID SOLUBLE SILVER COMPLEX TO AN IMAGE-CARRYING LAYER SO SUPERPOSED ADJACENT SAID EMULSION LAYER AS TO RECEIVE A DEPTHWISE DIFFUSION OF SAID SOLUTION FROM SAID EMULSION LAYER WITHOUT APPRECIABLY DISTURBING THE IMAGEWISE DISTRIBUTION OF THE SILVER COMPLEX IN SAID SOLUTION, AND REDUCING TO SILVER THE SILVER IONS OF SAID SOLUBLE SILVER COMPLEX IN THE PRESENCE OF A LEAD SALT SOLUBLE IN SAID SOLUTION TO FORM AN IMAGE IN SILVER WHICH IS A POSITIVE OF THE SUBJECT MATTER OF SAID LATENT IMAGE.
Claim 4
Dependent Claim
143 words
THE PROCESS OF FORMING POSITIVE IMAGES IN SILVER WHICH COMPRISES DEVELOPING A LATENT NEGATIVE IMAGE IN A SILVER HALIDE EMULSION LAYER WITH A SOLUTION COMPRISING A SILVER HALIDE DEVELOPER AND A SILVER HALIDE SOLVENT TO FORM AN IMAGEWISE DISTRIBUTION OF SOL,UBLE SILVER COMPLEX IN SAID EMULSION LAYER, TRANSFERRING FROM SAID EMULSION LAYER BY IMBIBITION AT LEAST PART OF SAID IMAGEWISE DISTRIBUTION OF SAID SOLUBLE SILVER COMPLEX TO AN IMAGE-CARRYING LAYER SO SUPERPOSED ADJACENT SAID EMULSION LAYER AS TO RECEIVE A DEPTHWISE DIFFUSION OF SAID SOLUTION FROM SAID EMULSION LAYER WITHOUT APPRECIABLY DISTURBING THE IMAGEWISE DISTRIBUTION OF THE SILVER COMPLEX IN SAID SOLUTION, AND REDUCING TO SILVER THE SILVER IONS OF SAID SOLUBLE SILVER COMPLEX IN THE PRESENCE OF A LEAD SALT SOLUBLE IN SAID SOLUTION TO FORM AN IMAGE IN SILVER WHICH IS A POSITIVE OF THE SUBJECT MATTER OF SAID LATENT IMAGE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-28 | 1955-07-30 | 1956-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-28 | 1959-07-30 | 1960-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-28 | 1963-07-30 | 1964-01-29 | $7700.00 | Window Closed / Lapsed |