Patent US3353957A successfully refreshed from Google Patents.
US3353957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic process
Assignee: EIDP Inc
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Filing: 1964-10-12
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Granted: 1967-11-21
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Expires: 1984-10-12
Abstract
No abstract record available.
Inventors
- 👤 Blake Ralph Kingsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:42
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C1/00; G03C1/005; G03C1/492
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
142 words
A PROCESS WHICH COMPRISES: (A) EXPOSING, IMAGEWISE, THE OUTER LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER OF A PHOTOGRRAPHIC ELEMENT HAVING A CONTIGUOUS INNER NON-FOGGED SILVER HALIDE LAYER ON A SUPPORT, THE SILVER SALT IN SAID INNER LAYER BEING AT LEAST AS SOLUBLE IN AQUEOUS DEVELOPER SOLUTION AS THE SILVER SALT IN THE OUTER LAYER, (B) DEVELOPING SAID EXPOSED OUTER LAYER TO FORM A SILVER IMAGE IN SAID LAYER, BY A DEVELOPER COMPOSITION SUBSTANTALLY DEVOID OF SILVER DIFFUSION TRANSFER CHARACTERISTICS; (C) DEVELOPING THE OUTER LAYER WITH AN AQUEOUS DEVELOPER SOLUTION HAVING SILVER DIFFUSION CHARACTERISTICS CONTAINING: (I) A DEVELOPING AGENT TAKEN FROM THE GROUP CONSISTING OF A POLYHYDROXYBENZEND, P-AMINOPHENOL AND 2,4-DIAMINOPHENOL, (II) AT LEAST ONE DEVELOPING AGENT TAKEN FROM THE GROUP CONSISTING OF A POLYHDROXYBENZEND, PAMINOPHENOL, 2,4-DIAMINOPHENOL, P-METHYLAMINOPHENOL, 1-PHENYL-3-PYRAZOLIDONE, 1-PHENYL-4METHYL-3-PYAZOLIDONE, AND ASCORBIC ACID, AND (III) A SILVER HALLIDE SOLVENT, AND (D) REMOVING THE OUTER LAYER.
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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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |