Patent US2774667A successfully refreshed from Google Patents.
US2774667A
Expired / Lapsed
US
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Photographic silver halide transfer process
Assignee: Polaroid Corp
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Filing: 1951-07-02
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Granted: 1956-12-18
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Expires: 1971-07-02
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
- 👤 Meroe M Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:35
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/26; G03C8/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE PROCESS FOR FORMING IMAGES IN SILVER WHICH COMPRISES DEVELOPING A LATENT IMAGE IN A SILVER HALIDE EMULSION, REACTING A SILVER HALIDE SOLVENT WITH PART AT LEAST OF THE UNDEVELOPED SILVER HALIDE OF SAID EMULSION, TRANSFERRING AT LEAST PART OF SAID SOLUBLE SILVER COMPLEX TO AN IMAGE-RECEIVING MATERIAL COMPRISING A SILVER PRECIPITATING AGENT DISPERSED IN A SILICA MATRIX FORMED BY THE HARDENING IN SITU OF A COLLOIDAL SOLUTION OF HYDRATED SILICA WHOSE SILICA PARTICLES HAVE A PARTICLE SIZE AVERAGING LESS THAN 30 MILLIMICRONS, AND PRECIPITATING THE SILVER OF SAID COMPLEX AT SAID IMAGE-RECEIVING MATERIAL TO FORM A PRINT OF SAID LATENT IMAGE AMONG SAID HYDRATED SILICA.
Claim 2
Dependent Claim
106 words
THE PROCESS FOR FORMING IMAGES IN SILVER WHICH COMPRISES DEVELOPING A LATENT IMAGE IN A SILVER HALIDE EMULSION, REACTING A SILVER HALIDE SOLVENT WITH PART AT LEAST OF THE UNDEVELOPED SILVER HALIDE OF SAID EMULSION, TRANSFERRING AT LEAST PART OF SAID SOLUBLE SILVER COMPLEX TO AN IMAGE-RECEIVING MATERIAL COMPRISING A SILVER PRECIPITATING AGENT DISPERSED IN A SILICA MATRIX FORMED BY THE HARDENING IN SITU OF A COLLOIDAL SOLUTION OF HYDRATED SILICA WHOSE SILICA PARTICLES HAVE A PARTICLE SIZE AVERAGING LESS THAN 30 MILLIMICRONS, AND PRECIPITATING THE SILVER OF SAID COMPLEX AT SAID IMAGE-RECEIVING MATERIAL TO FORM A PRINT OF SAID LATENT IMAGE AMONG SAID HYDRATED SILICA.
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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) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |