US2765240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming print-receiving elements
Assignee: Polaroid Corp
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Filing: 1953-01-15
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Granted: 1956-10-02
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Expires: 1973-01-15
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:35
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/26; G03C8/28; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A PROCESS FOR FORMING PRINT-RECEIVING ELEMENTS WHICH COMPRISES THE STEPS OF CREATING A MIXTURE, IN A LIQUID SUSPENDING MEDIUM, OF MINUTE PARTICLES OF A RELATIVELY INERT, INSOLUBLE, ADSORBENT SUBSTANCE AND A SUBSTANTIALLY LESSER CONCENTRATION OF A SILVER PRECIPITATING AGENT, SAID SUBSTANCE BEING INSOLUBLE IN WATER AND IN SAID LIQUID DISPERSING MEDIUM AND CHEMICALLY INERT TO SILVER HALIDE EMULSIONS AND TO PHOTOGRAPHIC SILVER HALIDE DEVELOPERS AND FIXING AGENTS, SAID SILVER PRECIPITATING AGENT BEING DISPERSED AMONG SAID PARTICLES OF SAID SUBSTANCE AND BEING CAPABLE OF AIDING IN THE REDUCTION AND PRECIPITATION OF METALLIC SILVER FROM SILVER COMPLEX IONS IN THE PRESENCE OF A SILVER HALIDE DEVELOPING AGENT, COATING THE LIQUID DISPERSION SO FORMED IN A THIN LAYER ON A SHEET SUPPORT, AND DRYING SAID COATING TO PROVIDE SAID SUPPORT WITH A THIN SILVER PRECIPITATION LAYER PERMEABLE TO THE IONIC CONTENT OF AN AQUEOUS SOLUTION OF A SOLUBLE SILVER COMPLEX, SAID PRECIPITATION LAYER COMPRISING A MATRIX OF SAID SUBSTANCE THROUGHOUT WHICH IS DISPERSED SAID SILVER PRECIPITATING AGENT.
Claim 2
Dependent Claim
164 words
A PROCESS FOR FORMING PRINT-RECEIVING ELEMENTS WHICH COMPRISES THE STEPS OF CREATING A MIXTURE, IN A LIQUID SUSPENDING MEDIUM, OF MINUTE PARTICLES OF A RELATIVELY INERT, INSOLUBLE, ADSORBENT SUBSTANCE AND A SUBSTANTIALLY LESSER CONCENTRATION OF A SILVER PRECIPITATING AGENT, SAID SUBSTANCE BEING INSOLUBLE IN WATER AND IN SAID LIQUID DISPERSING MEDIUM AND CHEMICALLY INERT TO SILVER HALIDE EMULSIONS AND TO PHOTOGRAPHIC SILVER HALIDE DEVELOPERS AND FIXING AGENTS, SAID SILVER PRECIPITATING AGENT BEING DISPERSED AMONG SAID PARTICLES OF SAID SUBSTANCE AND BEING CAPABLE OF AIDING IN THE REDUCTION AND PRECIPITATION OF METALLIC SILVER FROM SILVER COMPLEX IONS IN THE PRESENCE OF A SILVER HALIDE DEVELOPING AGENT, COATING THE LIQUID DISPERSION SO FORMED IN A THIN LAYER ON A SHEET SUPPORT, AND DRYING SAID COATING TO PROVIDE SAID SUPPORT WITH A THIN SILVER PRECIPITATION LAYER PERMEABLE TO THE IONIC CONTENT OF AN AQUEOUS SOLUTION OF A SOLUBLE SILVER COMPLEX, SAID PRECIPITATION LAYER COMPRISING A MATRIX OF SAID SUBSTANCE THROUGHOUT WHICH IS DISPERSED SAID SILVER PRECIPITATING AGENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-02 | 1960-04-02 | 1960-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-02 | 1964-04-02 | 1964-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-02 | 1968-04-02 | 1968-10-02 | $7700.00 | Window Closed / Lapsed |